Related ports: 123   259   264   1701   1723   4500  

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External Resources SANS Internet Storm Center: port 500

Notes: Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service. IANA is responsible for internet protocol resources, including the registration of commonly used port numbers for well-known internet services. Well Known Ports: 0 through 1023. Registered Ports: 1024 through 49151. Dynamic/Private : 49152 through 65535. TCP ports use the Transmission Control Protocol, the most commonly used protocol on the Internet and any TCP/IP network. TCP enables two hosts to establish a connection and exchange streams of data. TCP guarantees delivery of data and that packets will be delivered in the same order in which they were sent. Guaranteed communication/delivery is the key difference between TCP and UDP. UDP ports use the Datagram Protocol. Like TCP, UDP is used in combination with IP (the Internet Protocol) and facilitates the transmission of datagrams from one computer to applications on another computer, but unlike TCP, UDP is connectionless and does not guarantee reliable communication; it's up to the application that received the message to process any errors and verify correct delivery. UDP is often used with time-sensitive applications, such as audio/video streaming and realtime gaming, where dropping some packets is preferable to waiting for delayed data. When troubleshooting unknown open ports, it is useful to find exactly what services/processes are listening to them. This can be accomplished in both Windows command prompt and Linux variants using the "netstat -aon" command. We also recommend runnig multiple anti-virus/anti-malware scans to rule out the possibility of active malicious software. For more detailed and personalized help please use our forums.

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Service overview and network port requirements for Windows

  • 12 contributors

This article discusses the required network ports, protocols, and services that are used by Microsoft client and server operating systems, server-based programs, and their subcomponents in the Microsoft Windows Server system. Administrators and support professionals may use this article as a roadmap to determine which ports and protocols Microsoft operating systems and programs require for network connectivity in a segmented network.

Applies to:   Windows Server 2019, Windows Server 2016, Windows Server 2012 R2, Windows 10, version 2004, Windows 10, version 1909, Windows 10, version 1903, Windows 7 Service Pack 1 Original KB number:   832017

This article contains several references to the default dynamic port range. In Windows Server 2008 and later versions, and in Windows Vista and later versions, the default dynamic port range changed to the following range:

  • Start port: 49152
  • End port: 65535

Windows 2000, Windows XP, and Windows Server 2003 use the following dynamic port range:

  • Start port: 1025
  • End port: 5000

What this means for you:

  • If your computer network environment uses only Windows Server 2012 or a later version of Windows, you must enable connectivity over the high port range of 49152 through 65535.
  • If your computer network environment uses Windows Server 2012 together with versions of Windows earlier than Windows Server 2008 and Windows Vista, you must enable connectivity over both the following port ranges: High port range 49152 through 65535 Low port range 1025 through 5000

If your computer network environment uses only versions of Windows earlier than Windows Server 2008 and Windows Vista, you must enable connectivity over the low port range of 1025 through 5000.

For more information about the default dynamic port range, see The default dynamic port range for TCP/IP has changed .

Don't use the port information in this article to configure Windows Firewall. For information about how to configure Windows Firewall, see Windows Firewall with Advanced Security .

The Windows Server system includes a comprehensive and integrated infrastructure to meet the requirements of developers and information technology (IT) professionals. This system runs programs and solutions that you can use to obtain, analyze, and share information quickly and easily. These Microsoft client, server, and server program products use different network ports and protocols to communicate with client systems and with other server systems over the network. Dedicated firewalls, host-based firewalls, and Internet Protocol security (IPsec) filters are other important components that you must have to help secure your network. However, if these technologies are configured to block ports and protocols that are used by a specific server, that server will no longer respond to client requests.

The following list provides an overview of the information that this article contains:

The System services ports section:

  • Contains a brief description of each service.
  • Displays the logical name of each service.
  • Indicates the ports and protocols that each service requires for correct operation.

Use this section to help identify the ports and protocols that a particular service uses.

The Ports and protocols section includes a table that summarizes the information from the System services ports section. The table is sorted by the port number instead of by the service name. Use this section to quickly determine which services listen on a particular port.

This article uses certain terms in specific ways. To help avoid confusion, make sure that you understand how the article uses these terms:

  • System services: System services are programs that load automatically as part of an application's startup process or as part of the operating system startup process. System services support the different tasks that the operating system must perform. For example, some system services that are available on computers that run Windows Server 2003 Enterprise Edition include the Server service, the Print Spooler service, and the World Wide Web Publishing service. Each system service has a friendly service name and a service name . The friendly service name is the name that appears in graphical management tools such as the Services Microsoft Management Console (MMC) snap-in. The service name is the name that is used with command-line tools and with many scripting languages. Each system service may provide one or more network services.
  • Application protocol: In this article, application protocol refers to a high-level network protocol that uses one or more TCP/IP protocols and ports. Examples of application protocols include HTTP, server message blocks (SMBs), and Simple Mail Transfer Protocol (SMTP).
  • Protocol: TCP/IP protocols are standard formats for communicating between devices on a network. TCP/IP protocols operate at a lower level than the application protocols. The TCP/IP suite of protocols includes TCP, User Datagram Protocol (UDP), and Internet Control Message Protocol (ICMP).
  • Port: It's the network port that the system service listens on for incoming network traffic.

This article doesn't specify which services rely on other services for network communication. For example, many services rely on the Remote Procedure Call (RPC) or DCOM features in Microsoft Windows to assign them dynamic TCP ports. The Remote Procedure Call service coordinates requests by other system services that use RPC or DCOM to communicate with client computers. Many other services rely on network basic input/output system (NetBIOS) or SMBs, protocols that are provided by the Server service. Other services rely on HTTP or on Hypertext Transfer Protocol Secure (HTTPS). These protocols are provided by Internet Information Services (IIS). A full discussion of the architecture of the Windows operating systems is beyond the scope of this article. However, detailed documentation on this subject is available on Microsoft TechNet and on the Microsoft Developer Network (MSDN) websites. Although many services may rely on a particular TCP or UDP port, only one service or process at a time can listen on that port.

When you use RPC with TCP/IP or with UDP/IP as the transport, incoming ports are frequently dynamically assigned to system services as required. TCP/IP and UDP/IP ports that are higher than port 1024 are used. These ports are also informally known as random RPC ports . In these cases, RPC clients rely on the RPC endpoint mapper to tell them which dynamic port or ports were assigned to the server. For some RPC-based services, you can configure a specific port instead of letting RPC dynamically assign a port. You can also restrict the range of ports that RPC dynamically assigns to a small range, regardless of the service. For more information about this topic, see the References section.

This article includes information about the system services roles and the server roles for the Microsoft products that are listed in the Applies to section. Although this information may also apply to Windows XP and to Microsoft Windows 2000 Professional, this article is focused on server-class operating systems. Therefore, this article describes the ports that a service listens on instead of the ports that client programs use to connect to a remote system.

System services ports

This section provides a description of each system service, includes the logical name that corresponds to the system service, and displays the ports and the protocols that each service requires.

Active Directory (local security authority)

Active Directory runs under the Lsass.exe process and includes the authentication and replication engines for Windows domain controllers. Domain controllers, client computers, and application servers require network connectivity to Active Directory over specific hard-coded ports. Additionally, unless a tunneling protocol is used to encapsulate traffic to Active Directory, a range of ephemeral TCP ports between 1024 to 5000 and 49152 to 65535 are required.

If your computer network environment uses only Windows Server 2008 R2, Windows Server 2008, Windows 7, Windows Vista or later versions, you must enable connectivity over the high port range of 49152 through 65535.

If your computer network environment uses Windows Server 2008 R2, Windows Server 2008, Windows 7, Windows Vista or later versions together with versions of Windows earlier than Windows Server 2008 and Windows Vista, you must enable connectivity over both port ranges: High port range of 49152 through 65535 Low port range of 1025 through 5000

An encapsulated solution might consist of a VPN gateway located behind a filtering router that uses Layer 2 Tunneling Protocol (L2TP) together with IPsec. In this encapsulated scenario, you must allow the following items through the router instead of opening all the ports and protocols listed in this topic:

  • IPsec Encapsulating Security Protocol (ESP) (IP protocol 50)
  • IPsec Network Address Translator Traversal NAT-T (UDP port 4500)
  • IPsec Internet Security Association and Key Management Protocol (ISAKMP) (UDP port 500)

Finally, you can hard-code the port that is used for Active Directory replication by following the steps in Restricting Active Directory RPC traffic to a specific port . System service name: LSASS .

Packet filters for L2TP traffic are not required, because L2TP is protected by IPsec ESP.

¹ For more information about how to customize this port, see Domain controllers and Active Directory in the References section. This section also includes remote WMI and DCOM communications first used in Windows Server 2012 domain controller promotion during prerequisite validation and with the Server Manager tool.

In addition, the Microsoft LDAP client uses ICMP pings to verify that an LDAP server it has a pending request with is still present on the network. The following settings are LDAP session options:

  • PingKeepAliveTimeout = 120 seconds (how long it waits after last response from server before it starts sending ping)
  • PingLimit = 4 (how many pings are sent before connection is closed)
  • PingWaitTimeout = 2000 ms (how long it waits for the ICMP response)
  • Reference: LdapSessionOptions Class

Application Layer Gateway service

This subcomponent of the Internet Connection Sharing/Internet Connection Firewall (ICF) service provides support for plug-ins that allow network protocols to pass through the firewall and work behind Internet Connection Sharing. Application Layer Gateway (ALG) plug-ins can open ports and change data (such as ports and IP addresses) that are embedded in packets. FTP is the only network protocol that has a plug-in that is included with Windows Server. The ALG FTP plug-in supports active FTP sessions through the network address translation (NAT) engine that these components use. The ALG FTP plug-in supports these sessions by redirecting all traffic that meets the following criteria to a private listening port in the range of 3000 to 5000 on the loopback adapter:

  • Passes through the NAT engine
  • Is directed toward port 21

The ALG FTP plug-in then monitors and updates FTP control channel traffic so that the FTP plug-in can forward port mappings through the NAT for the FTP data channels. The FTP plug-in also updates ports in the FTP control channel stream.

System service name: ALG

ASP.NET State Service

ASP.NET State Service provides support for ASP.NET out-of-process session states. ASP.NET State Service stores session data out-of-process. The service uses sockets to communicate with ASP.NET that is running on a web server.

System service name: aspnet_state

Certificate Services

Certificate Services is part of the core operating system. By using Certificate Services, a business can act as its own certification authority (CA). It lets the business issue and manage digital certificates for programs and protocols such as:

  • Secure/Multipurpose Internet Mail Extensions (S/MIME)
  • Secure Sockets Layer (SSL)
  • Encrypting File System (EFS)
  • Smart card logon

Certificate Services relies on RPC and DCOM to communicate with clients by using random TCP ports that are higher than port 1024.

System service name: CertSvc

¹ For more information about how to customize this port, see Remote Procedure Calls and DCOM in the References section.

For more information, see 3.2.2.6.2.1.4.5.9 msPKI-Certificate-Name-Flag .

Cluster service

The Cluster service controls server cluster operations and manages the cluster database. A cluster is a collection of independent computers that act as a single computer. Managers, programmers, and users see the cluster as a single system. The software distributes data among the nodes of the cluster. If a node fails, other nodes provide the services and data that were formerly provided by the missing node. When a node is added or repaired, the cluster software migrates some data to that node.

System service name: ClusSvc

Additionally, for successful validation on Windows Failover Clusters on 2008 and above, allow inbound and outbound traffic for ICMP4, ICMP6, and port 445/TCP for SMB.

¹ Cluster Service UDP traffic over port 3343 requires the Datagram Transport Layer Security (DTLS) protocol, version 1.0 or version 1.2. By default, DTLS is enabled. For more information, see Protocols in TLS/SSL (Schannel SSP) .

² For more information about how to customize these ports, see Remote Procedure Calls and DCOM in the References section.

  • Computer Browser

The Computer Browser system service maintains an up-to-date list of computers on your network and supplies the list to programs that request it. The Computer Browser service is used by Windows-based computers to view network domains and resources. Computers that are designated as browsers maintain browse lists that contain all shared resources that are used on the network. Earlier versions of Windows-based programs, such as My Network Places, the net view command, and Windows Explorer, all require browsing capability. For example, when you open My Network Places on a computer that is running Microsoft Windows 95, a list of domains and computers appears. To display this list, the computer obtains a copy of the browse list from a computer that is designated as a browser.

If you are running only Windows Vista and later versions of Windows, the browser service is no longer required.

System service name: Browser

The Browser service uses RPC over Named Pipes to compile.

Dynamic Host Configuration Protocol (DHCP) Server

The DHCP Server service uses the DHCP to automatically allocate IP addresses. You can use this service to adjust the advanced network settings of DHCP clients. For example, you can configure network settings such as Domain Name System (DNS) servers and Windows Internet Name Service (WINS) servers. You can establish one or more DHCP servers to maintain TCP/IP configuration information and to provide that information to client computers.

System service name: DHCPServer

  • Distributed File System Namespaces

The Distributed File System Namespaces (DFSN) integrates different file shares that are located on a local area network (LAN) or wide area network (WAN) into a single logical namespace. The DFSN service is required for Active Directory domain controllers to advertise the SYSVOL shared folder.

System service name: Dfs

2 The NETBIOS ports are optional and are not required when DFSN is using FQDN Server names.

  • Distributed File System Replication

The Distributed File System Replication (DFSR) service is a state-based, multi-master file replication engine that automatically copies updates to files and folders between computers that are participating in a common replication group. DFSR was added in Windows Server 2003 R2. You can configure DFSR by using the Dfsrdiag.exe command-line tool to replicate files on specific ports, regardless of whether they are participating in Distributed File System Namespaces (DFSN).

System service name: DFSR

¹ For more information about how to customize this port, see Distributed File Replication Service in the References section.

2 Port 5722 is only used on a Windows Server 2008 domain controller or on a Windows Server 2008 R2 domain controller. It is not used on a Windows Server 2012 domain controller.

  • Distributed Link Tracking Server

The Distributed Link Tracking Server system service stores information so that files that are moved between volumes can be tracked to each volume in the domain. The Distributed Link Tracking Server service runs on each domain controller in a domain. This service enables the Distributed Link Tracking Client service to track linked documents that are moved to a location in another NTFS file system volume in the same domain.

System service name: TrkSvr

  • Distributed Transaction Coordinator

The Distributed Transaction Coordinator (DTC) system service coordinates transactions that are distributed across multiple computer systems and resource managers, such as databases, message queues, file systems, or other transaction-protected resource managers. The DTC system service is required if transactional components are configured through Component Object Model Plus (COM+). It's also required for transactional queues in Message Queuing (also known as MSMQ) and SQL Server operations that span multiple systems.

System service name: MSDTC

¹ For more information about how to customize this port, see Distributed Transaction Coordinator in the References section.

The DNS Server service enables DNS name resolution by answering queries and update requests for DNS names. DNS servers are required to locate devices and services that are identified by using DNS names and to locate domain controllers in Active Directory.

System service name: DNS

The Event Log system service logs event messages that are generated by programs and by the Windows operating system. Event log reports contain information that you can use to diagnose problems. You view reports in Event Viewer. The Event Log service writes events that are sent to log files by programs, by services, and by the operating system. The events contain diagnostic information in addition to errors that are specific to the source program, the service, or the component. The logs can be viewed programmatically through the event log APIs or through the Event Viewer in an MMC snap-in.

System service name: Eventlog

The Event Log service uses RPC over named pipes. This service has the same firewall requirements as the File and Printer Sharing feature.

  • Fax Service

Fax Service, a Telephony API (TAPI) compliant system service, provides fax capabilities. Fax Service lets users use either a local fax device or a shared network fax device to send and receive faxes from their desktop programs.

System service name: Fax

File Replication

The File Replication service (FRS) is a file-based replication engine that automatically copies updates to files and folders between computers that are participating in a common FRS replica set. FRS is the default replication engine that is used to replicate the contents of the SYSVOL folder between Windows 2000-based domain controllers and Windows Server 2003-based domain controllers that are located in a common domain. You can use the DFS Administration tool to configure FRS to replicate files and folders between targets of a DFS root or link.

System service name: NtFrs

¹ For more information about how to customize this port, see File Replication Service in the References section.

FTP Publishing Service

FTP Publishing Service provides FTP connectivity. By default, the FTP control port is 21. However, you can configure this system service through the Internet Information Services (IIS) Manager snap-in. The default data (that is used for active mode FTP) port is automatically set to one port less than the control port. Therefore, if you configure the control port to port 4131, the default data port is port 4130. Most FTP clients use passive mode FTP. This means that the client first connects to the FTP server by using the control port. Next, the FTP server assigns a high TCP port between ports 1025 and 5000. Then, the client opens a second connection to the FTP server for transferring data. You can configure the range of high ports by using the IIS metabase.

System service name: MSFTPSVC

Group Policy

To successfully apply Group Policy, a client computer must be able to contact a domain controller over the Kerberos, LDAP, SMB, and RPC protocols. Windows XP and Windows Server 2003 additionally require the ICMP protocol.

If any one of these protocols is unavailable or blocked between the client and a relevant domain controller, Group Policy will not apply or update. For a cross-domain logon, where a computer is in one domain and the user account is in another domain, these protocols may be required for the client, the resource domain, and the account domain to communicate. ICMP is used for slow link detection.

System service name: Group Policy

¹ For more information about how to customize this port, see Domain controllers and Active Directory in the References section.

2 This protocol is required only by Windows XP and Windows Server 2003 acting as clients.

When the Group Policy Microsoft Management Console (MMC) snap-in creates Group Policy Results reports and Group Policy Modeling reports, it uses DCOM and RPC to send and to receive information from the Resultant Set of Policy (RSoP) provider on the client or on the domain controller. The various binary files that make up the Group Policy Microsoft Management Console (MMC) snap-in features primarily use COM calls to send or to receive information. When you initiate remote group policy results reporting from a Windows Server 2012 computer, access to the destination computer's event log is required. (See the Event Log section in this article for port requirements.)

Windows Server 2012 support the initiation of remote group policy update against Windows Server 2012 computers. This requires RPC/WMI access through port 135 and ports 49152-65535 inbound to the computer on which the policy is being refreshed.

The HTTP SSL system service enables IIS to perform SSL functions. SSL is an open standard for establishing an encrypted communications channel to help prevent the interception of extremely important information, such as credit card numbers. Although this service works on other Internet services, it is primarily used to enable encrypted electronic financial transactions on the World Wide Web (WWW). You can configure the ports for this service through the Internet Information Services (IIS) Manager snap-in.

System service name: HTTPFilter

Hyper-V service

Hyper-V replica

Hyper-V live migration

  • Internet Authentication Service

Internet Authentication Service (IAS) performs centralized authentication, authorization, auditing, and accounting of users who are connecting to a network. These users can be on a LAN connection or on a remote connection. IAS implements the Internet Engineering Task Force (IETF) standard Remote Authentication Dial-In User Service (RADIUS) protocol.

System service name: IAS

Internet Connection Firewall (ICF)/Internet Connection Sharing

This system service provides NAT, addressing, and name resolution services for all computers on your home network or your small-office network. When the Internet Connection Sharing feature is enabled, your computer becomes an Internet gateway on the network. Other client computers can then share one connection to the Internet, such as a dial-up connection or a broadband connection. This service provides basic DHCP and DNS services but will work with the full-featured Windows DHCP or DNS services. When ICF and Internet Connection Sharing act as a gateway for the rest of the computers on your network, they provide DHCP and DNS services to the private network on the internal network interface. They do not provide these services on the external network interface.

System service name: SharedAccess

IP Address Management (IPAM)

The IPAM client UI communicates with the IPAM server to perform remote management. It's done by using the Windows Communications Framework (WCF), which uses TCP as the transport protocol. By default, the TCP binding is performed on port 48885 on the IPAM server.

BranchCache information

  • Port 3702 (UDP) is used to discover the availability of cached content on a client.
  • Port 80 (TCP) is used to serve content to requesting clients.
  • Port 443 (TCP) is the default port that is used by the hosted cache to accept incoming client offers for content.

ISA/TMG Server

  • This port is not used with ISA 2000.
  • FWC application transport and protocols are negotiated within the FWC control channel.
  • ISA 2000 FWC control uses UDP. ISA 2004 and 2006 use TCP.
  • OEM uses Firewall Web Management to provide non-MMC management of ISA Server.
  • This port is also used for intra-array traffic.
  • This port is used only by the ISA management MMC during remote server and service status monitoring.
  • It's the range in TMG. Please note that TMG extends the default dynamic port ranges in Windows Server 2008 R2, Windows 7, Windows Server 2008, and Windows Vista.
  • Kerberos Key Distribution Center

When you use the Kerberos Key Distribution Center (KDC) system service, users can sign in to the network by using the Kerberos version 5 authentication protocol. As in other implementations of the Kerberos protocol, the KDC is a single process that provides two services: the Authentication Service and the Ticket-Granting Service. The Authentication Service issues ticket granting tickets, and the Ticket-Granting Service issues tickets for connection to computers in its own domain.

System service name: kdc

  • License Logging

The License Logging system service is a tool that was originally designed to help customers manage licenses for Microsoft server products that are licensed in the server client access license (CAL) model. License Logging was introduced with Microsoft Windows NT Server 3.51. By default, the License Logging service is disabled in Windows Server 2003. Because of legacy design constraints and evolving license terms and conditions, License Logging may not provide an accurate view of the total number of CALs that are purchased compared to the total number of CALs that are used on a particular server or across the enterprise. The CALs that are reported by License Logging may conflict with the interpretation of the Microsoft Software License Terms and with Product Use Rights (PUR). License Logging is not included in Windows Server 2008 and later operating systems. We recommend that only users of the Microsoft Small Business Server family of operating systems enable this service on their servers.

System service name: LicenseService

The License Logging service uses RPC over named pipes. This service has the same firewall requirements as the File and Printer Sharing feature.

Message Queuing

The Message Queuing system service is a messaging infrastructure and development tool for creating distributed messaging programs for Windows. These programs can communicate across heterogeneous networks and can send messages between computers that may be temporarily unable to connect to one another. Message Queuing helps provide security, efficient routing, support for sending messages within transactions, priority-based messaging, and guaranteed message delivery.

System service name: MSMQ

Microsoft Exchange Message Transfer Agent (MTA) stacks

In Microsoft Exchange 2000 Server and Exchange Server 2003, the MTA is frequently used to provide backward-compatible message transfer services between Exchange 2000 Server-based servers and Exchange Server 5.5-based servers in a mixed-mode environment.

System service name: MSExchangeMTA

Microsoft POP3 service

The Microsoft POP3 service provides email transfer and retrieval services. Administrators can use this service to store and manage email accounts on the mail server. When you install POP3 service on the mail server, users can connect to the mail server and can retrieve email messages by using an email client that supports the POP3 protocol, such as Microsoft Outlook.

System service name: POP3SVC

The Net Logon system service maintains a security channel between your computer and the domain controller to authenticate users and services. It passes the user's credentials to a domain controller and returns the domain security identifiers and the user rights for the user. This is typically known as pass-through authentication. Net Logon is configured to start automatically only when a member computer or domain controller is joined to a domain. In the Windows 2000 Server and Windows Server 2003 families, Net Logon publishes service resource locator records in the DNS. When this service runs, it relies on the WORKSTATION service and on the Local Security Authority service to listen for incoming requests. On domain member computers, Net Logon uses RPC over named pipes. On domain controllers, it uses RPC over named pipes, RPC over TCP/IP, mail slots, and Lightweight Directory Access Protocol (LDAP).

System service name: Netlogon

2 The NETBIOS ports are optional. Netlogon uses these only for trusts that don't support DNS or when DNS fails during an attempted fallback. If there is no WINS infrastructure and broadcasts can't work, you should either disable NetBt or set the computers and servers to NodeType=2.

The Net Logon service uses RPC over named pipes for earlier versions of Windows clients. This service has the same firewall requirements as the File and Printer Sharing feature.

Network News Transfer Protocol (NNTP)

The Network News Transfer Protocol (NNTP) system service lets computers that are running Windows Server 2003 act as news servers. Clients can use a news client, such as Microsoft Outlook Express, to retrieve newsgroups from the server and to read the headers or the bodies of the articles in each newsgroup.

System service name: NNTPSVC

Offline Files, User Profile Service, Folder Redirection, and Primary Computer

Offline Files and Roaming User Profiles cache user data to computers for offline use. These capabilities exist in all supported Microsoft operating systems. Windows XP implemented roaming user profile caching as part of the Winlogon process while Windows Vista, Windows Server 2008, and later operating systems use the User Profile Service. All of these systems use SMB.

Folder Redirection redirects user data from the local computer to a remote file share, using SMB.

The Primary Computer system for Windows is part of the Roaming User Profile and Offline Files services. Primary Computer provides a capability to prevent data caching to computers that are not authorized by administrators for specific users. Primary Computer uses LDAP to determine the configuration and does not perform any data transfer using SMB; it instead alters the default Offline Files and Roaming User Profile behaviors. This system was added in Windows Server 2012.

System service names: ProfSvc , CscService

Performance Logs and Alerts

The Performance Logs and Alerts system service collects performance data from local or remote computers based on preconfigured schedule parameters and then writes that data to a log or triggers a message. Based on the information that is contained in the named log collection setting, the Performance Logs and Alerts service starts and stops each named performance data collection. This service runs only if at least one performance data collection is scheduled.

System service name: SysmonLog

  • Print Spooler

The Print Spooler system service manages all local and network print queues and controls all print jobs. Print Spooler is the center of the Windows printing subsystem. It manages the print queues on the system and communicates with printer drivers and input/output (I/O) components, such as the USB port and the TCP/IP protocol suite.

System service name: Spooler

The Print Spooler service uses RPC over named pipes. This service has the same firewall requirements as the File and Printer Sharing feature.

  • Remote Installation

You can use the Remote Installation system service to install Windows 2000, Windows XP, and Windows Server 2003 on Pre-Boot Execution Environment (PXE) remote boot-enabled client computers. The Boot Information Negotiation Layer (BINL) service, the primary component of Remote Installation Server (RIS), answers PXE client requests, checks Active Directory for client validation, and passes client information to and from the server. The BINL service is installed when you add the RIS component from Add/Remove Windows Components, or you can select it when you first install the operating system.

System service name: BINLSVC

  • Remote Procedure Call (RPC)

The Remote Procedure Call (RPC) system service is an interprocess communication (IPC) mechanism that enables data exchange and invocation of functionality that is located in a different process. The different process can be on the same computer, on the LAN, or in a remote location, and it can be accessed over a WAN connection or over a VPN connection. The RPC service serves as the RPC Endpoint Mapper and Component Object Model (COM) Service Control Manager. Many services depend on the RPC service to start successfully.

System service name: RpcSs

  • RPC does not use only the hard-coded ports that are listed in the table. Ephemeral range ports that are used by Active Directory and other components occur over RPC in the ephemeral port range. The ephemeral port range depends on the server operating system that the client operating system is connected to.
  • The RPC Endpoint Mapper also offers its services by using named pipes. This service has the same firewall requirements as the File and Printer Sharing feature.
  • Remote Procedure Call (RPC) Locator

The Remote Procedure Call (RPC) Locator system service manages the RPC name service database. When this service is turned on, RPC clients can locate RPC servers. By default, this service is turned off.

System service name: RpcLocator

The RPC Locator service offers its services by using RPC over named pipes. This service has the same firewall requirements as the File and Printer Sharing feature.

  • Remote Storage Notification

The Remote Storage Notification system service notifies users when they read from or write to files that are available only from a secondary storage media. Stopping this service prevents this notification.

System service name: Remote_Storage_User_Link

  • Remote Storage

The Remote Storage system service stores infrequently used files on a secondary storage medium. If you stop this service, users cannot move or retrieve files from the secondary storage media.

System service name: Remote_Storage_Server

  • Routing and Remote Access

The Routing and Remote Access service provides multiprotocol LAN-to-LAN, LAN-to-WAN, VPN, and NAT routing services. The Routing and Remote Access service also provides dial-up and VPN remote access services. Although the Routing and Remote Access service can use all the following protocols, the service typically uses only a few of them. For example, if you configure a VPN gateway that is behind a filtering router, you will probably use only one protocol. If you use L2TP with IPsec, you must allow IPsec ESP (IP protocol 50), NAT-T (UDP on port 4500), and IPsec ISAKMP (UDP on port 500) through the router.

Although NAT-T and IPsec ISAKMP are required for L2TP, these ports are monitored by the Local Security Authority. For more information about this, see the References section.

System service name: RemoteAccess

The Server system service provides RPC support and file sharing, print sharing, and named pipe sharing over the network. The Server service lets users share local resources, such as disks and printers, so that other users on the network can access them. It also enables named pipe communication between programs that are running on the local computer and on other computers. Named pipe communication is memory that is reserved for the output of one process to be used as input for another process. The input-accepting process does not have to be local to the computer.

If a computer name resolves to multiple IP addresses by using WINS, or if WINS failed and the name is resolved by using DNS, NetBIOS over TCP/IP (NetBT) tries to ping the IP address or addresses of the file server. Port 139 communications depend on Internet Control Message Protocol (ICMP) echo messages. If IP version 6 (IPv6) is not installed, port 445 communications will also depend on ICMP for name resolution. Preloaded Lmhosts entries will bypass the DNS resolver. If IPv6 is installed on computers that are running Windows Server 2003 or Windows XP operating systems, port 445 communications do not trigger ICMP requests.

The NetBIOS ports that are listed here are optional. Windows 2000 and newer clients can work over port 445.

System service name: lanmanserver

SharePoint Portal Server

The SharePoint Portal Server system service lets you develop an intelligent portal that seamlessly connects users, teams, and knowledge. It helps people take advantage of relevant information across business processes. Microsoft SharePoint Portal Server 2003 provides an enterprise business solution that integrates information from various systems into one solution through single sign-on and enterprise application integration capabilities.

  • Simple Mail Transfer Protocol (SMTP)

The Simple Mail Transfer Protocol (SMTP) system service is an email submission and relay agent. It accepts and queues email messages for remote destinations, and it retries at set intervals. Windows domain controllers use the SMTP service for intersite e-mail-based replication. The Collaboration Data Objects (CDO) for the Windows Server 2003 COM component can use the SMTP service to submit and to queue outgoing email messages.

System service name: SMTPSVC

Simple TCP/IP Services

Simple TCP/IP Services implements support for the following protocols:

  • Echo, port 7, RFC 862
  • Discard, port 9, RFC 863
  • Character Generator, port 19, RFC 864
  • Daytime, port 13, RFC 867
  • Quote of the Day, port 17, RFC 865

System service name: SimpTcp

Simple Network Management Protocol (SNMP) Service

SNMP Service lets the local computer service incoming SNMP requests. SNMP Service includes agents that monitor activity in network devices and report to the network console workstation. SNMP Service provides a method of managing network hosts (such as workstation or server computers, routers, bridges, and hubs) from a centrally located computer that is running network management software. SNMP performs management services by using a distributed architecture of management systems and agents.

System service name: SNMP

SNMP Trap Service

SNMP Trap Service receives trap messages that are generated by local or by remote SNMP agents. Then the SNMP Trap Service forwards those messages to SNMP management programs that are running on your computer. When SNMP Trap Service is configured for an agent, the service generates trap messages if any specific events occur. These messages are sent to a trap destination. For example, an agent can be configured to start an authentication trap if an unrecognized management system sends a request for information. Trap destinations include the computer name, the IP address, or the Internetwork Packet Exchange (IPX) address of the management system. The trap destination must be a network-enabled host that is running SNMP management software.

System service name: SNMPTRAP

Simple Service Discovery Protocol (SSDP) Discovery Service

SSDP Discovery Service implements SSDP as a Windows service. SSDP Discovery Service manages receipt of device presence announcements, updates its cache, and sends these notifications to clients that have outstanding search requests. SSDP Discovery Service also accepts the registration of event callbacks from clients. The registered event callbacks are then turned into subscription requests. SSDP Discovery Service then monitors for event notifications and sends these requests to the registered callbacks. This system service also provides periodic announcements to hosted devices. Currently, the SSDP event notification service uses TCP port 5000.

Starting with Windows XP Service Pack 2 (SP2), the SSDP event notification service uses TCP port 2869.

System service name: SSDPRSR

TCP/IP Print Server

The TCP/IP Print Server system service enables TCP/IP-based printing by using the Line Printer Daemon (LPD) protocol. The LPD service on the server receives documents from Line Printer Remote (LPR) utilities that are running on UNIX computers.

System service name: LPDSVC

The Telnet system service for Windows provides ASCII terminal sessions to Telnet clients. A Telnet server supports two kinds of authentication and supports the following kinds of terminals:

  • American National Standards Institute (ANSI)

System service name: TlntSvr

Remote Desktop Services (RDS)

RDS provides a multi-session environment that enables client devices to access a virtual Windows desktop session and Windows-based programs that are running on the server. RDS enables multiple users to be connected interactively to a computer.

System service name: TermService

RDS Licensing (RDSL)

The RDSL system service installs a license server and provides licenses to registered clients when the clients connect to a RDS server (a server that has RDS enabled). RDSL is a low-impact service that stores the client licenses that are issued for a RDS server and tracks the licenses that are issued to client computers or servers.

System service name: TermServLicensing

RDSL offers its services by using RPC over named pipes. This service has the same firewall requirements as the File and Printer Sharing feature.

  • Remote Desktop Connection Broker

The Remote Desktop Connection Broker system service enables clusters of load-balanced RDS servers to correctly route a user's connection request to the server where the user already has a session running. Users are routed to the first-available RDS server regardless of whether they are running another session in the server cluster. The load-balancing functionality pools the processing resources of several servers by using the TCP/IP networking protocol. You can use this service together with a cluster of RDS servers to increase the performance of a single RDS server by distributing sessions across multiple servers. Remote Desktop Connection Broker keeps track of disconnected sessions on the cluster and makes sure that users are reconnected to those sessions.

System service name: Tssdis

Trivial FTP Daemon

The Trivial FTP Daemon system service does not require a user name or a password and is an important part of the Remote Installation Services (RIS). The Trivial FTP Daemon service implements support for the Trivial FTP Protocol (TFTP) that is defined by the following RFCs:

  • RFC 1350 - TFTP
  • RFC 2347 - Option extension
  • RFC 2348 - Block size option
  • RFC 2349 - Time-out interval, and transfer size options

Trivial File Transfer Protocol (TFTP) is an FTP that supports diskless startup environments. The TFTP service listens on UDP port 69, but it responds from a randomly allocated high port. Therefore, when you enable this port, the TFTP service receives incoming TFTP requests, but it does not let the selected server respond to those requests. The service is free to respond to any such request from any source port, and the remote client then uses that port during the transfer. Communication is bidirectional. If you have to enable this protocol through a firewall, you may want to open UDP port 69 incoming. You can then rely on other firewall features that dynamically let the service respond through temporary holes on any other port.

System service name: tftpd

UPnP Device Host

The UPnP Device Host discovery system service implements all the components that are required for device registration, control, and the response to events for hosted devices. The information that is registered that relates to a device, such as the description, the lifetimes, and the containers, are optionally stored to disk and are announced on the network after registration or when the operating system restarts. The service also includes the web server that serves the device in addition to service descriptions and a presentation page.

System service name: UPNPHost

Windows Internet Name Service (WINS)

Windows Internet Name Service (WINS) enables NetBIOS name resolution. This service helps you locate network resources by using NetBIOS names. WINS servers are required unless all domains have been upgraded to the Active Directory directory service and unless all computers on the network are running Windows 2000 or later versions. WINS servers communicate with network clients by using NetBIOS name resolution. WINS replication is only required between WINS servers.

System service name: WINS

Windows Media Services

Windows Media Services in Windows Server 2003 and later versions replaces the following services that are included in Windows Media Services versions 4.0 and 4.1:

  • Windows Media Monitor Service
  • Windows Media Program Service
  • Windows Media Station Service
  • Windows Media Unicast Service

Windows Media Services is now a single service that runs on Windows Server. Its core components were developed by using COM, and it has a flexible architecture that you can customize for specific programs. Windows Media Services supports a larger variety of control protocols. These include Real Time Streaming Protocol (RTSP), Microsoft Media Server (MMS) protocol, and HTTP.

System service name: WMServer

Windows Remote Management (WinRM)

System service name: WinRM

For more information, see Installation and Configuration for Windows Remote Management .

  • Windows Time

The Windows Time system service maintains date and time synchronization on all the computers on a network that are running Windows XP or later versions and Windows Server 2003 or later versions. This service uses Network Time Protocol (NTP) to synchronize computer clocks so that an accurate clock value, or time stamp, is assigned for network validation and for resource access requests. The implementation of NTP and the integration of time providers help make Windows Time a reliable and scalable time service for your business. For computers that are not joined to a domain, you can configure Windows Time to synchronize time with an external time source. If this service is turned off, the time setting for local computers is not synchronized with a time service in the Windows domain or with an externally configured time service. Windows Server 2003 uses NTP. NTP runs on UDP port 123. The Windows 2000 version of this service uses Simple Network Time Protocol (SNTP). SNTP also runs on UDP port 123.

When the Windows Time service uses a Windows domain configuration, the service requires domain controller location and authentication services. Therefore, the ports for Kerberos and DNS are required.

System service name: W32Time

  • World Wide Web Publishing Service

World Wide Web Publishing Service provides the infrastructure that you must have to register, manage, monitor, and serve websites and programs that are registered with IIS. This system service contains a process manager and a configuration manager. The process manager controls the processes where custom applications and websites reside. The configuration manager reads the stored system configuration for World Wide Web Publishing Service and makes sure that Http.sys is configured to route HTTP requests to the appropriate application pools or operating system processes. You can use the Internet Information Services (IIS) Manager snap-in to configure the ports that are used by this service. If the administrative website is enabled, a virtual website is created that uses HTTP traffic on TCP port 8098.

System service name: W3SVC

Ports and protocols

The following table summarizes the information from the System services ports section. This table is sorted by port number instead of by service name.

Port 5722 is only used on a Windows Server 2008 domain controller or a Windows Server 2008 R2 domain controller; it is not used on a Windows Server 2012 domain controller. Port 445 is used by DFSR only when creating a new empty replicated folder.

Microsoft provides part of the information that is in this table in a Microsoft Excel worksheet. This worksheet is available for download from the Microsoft Download Center.

Active Directory port and protocol requirements

Application servers, client computers, and domain controllers that are located in common or external forests have service dependencies so that user-initiated and computer-initiated operations such as domain join, logon authentication, remote administration, and Active Directory replication work correctly. Such services and operations require network connectivity over specific port and networking protocols.

A summarized list of services, ports, and protocols required for member computers and domain controllers to inter-operate with one another or for application servers to access Active Directory include but are not limited to the following.

The list of services on which Active Directory depends:

  • Active Directory / LSA
  • Distributed File System Replication (if not using FRS for SYSVOL replication)
  • File Replication Service (if not using DFSR for SYSVOL replication)
  • WINS (in Windows Server 2003 SP1 and later versions for backup Active Directory replication operations, if DNS is not working)

The list of services that require Active Directory services:

  • Certificate Services (required for specific configurations)
  • DHCP Server
  • Distributed File System Namespaces (if using domain-based namespaces)
  • File Replication Service

The Help files for each Microsoft product that is described in this article contain more information that you may find useful to help configure your programs.

For information about Active Directory Domain Services firewalls and ports, see How to configure a firewall for Active Directory domains and trusts .

General information

For more information about how to help secure Windows Server and for sample IPsec filters for specific server roles, see Microsoft Security Compliance Manager . This tool aggregates all previous security recommendations and security documentation into a single utility for all support Microsoft operating systems:

  • Windows security baselines
  • Windows Server 2008 R2 Security Baseline
  • Windows Server 2008 Security Baseline
  • Windows Server 2003 Security Baseline
  • Windows 7 Security Baseline
  • Windows Vista Security Baseline
  • Windows XP Security Baseline

For more information about operating system services, security settings, and IPsec filtering, see one of the following Threats and Countermeasures Guides:

  • Threats and Countermeasures Guide: Security Settings in Windows Server 2008 R2 and Windows 7
  • Threats and Countermeasures Guide: Security Settings in Windows Server 2008 and Windows Vista
  • Threats and Countermeasures: Security Settings in Windows Server 2003 and Windows XP

For more information, see:

  • Network Ports Used by Key Microsoft Server Products
  • Active Directory and Active Directory Domain Services Port Requirements .

The Internet Assigned Numbers Authority coordinates the use of well-known ports. To view this organization's list of TCP/IP port assignments, see Service Name and Transport Protocol Port Number Registry .

Remote Procedure Calls and DCOM

For a detailed description of RPC, see Remote Procedure Call (RPC) .

For more information about how to configure RPC to work with a firewall, see How to configure RPC dynamic port allocation to work with firewalls .

For more information about the RPC protocol and about how computers that are running Windows 2000 initialize, see Windows 2000 Startup and Logon Traffic Analysis .

Domain controllers and Active Directory

For more information about how to restrict Active Directory replication and client logon traffic, see Restricting Active Directory replication traffic and client RPC traffic to a specific port .

For an explanation of how the Directory System Agent, LDAP, and the local system authority are related, see Directory System Agent .

For more information about how LDAP and the global catalog work, see How the Global Catalog works .

Exchange Server

For information about ports, authentication, and encryption for all data paths that are used by Microsoft Exchange Server, see Network ports for clients and mail flow in Exchange .

There may be additional things to consider for your particular environment. You can receive more information and help planning an Exchange implementation from the following Microsoft websites:

  • Exchange Server 2013
  • Exchange Server 2007
  • Exchange Server 2003

For more information, see Configure Outlook Anywhere in Outlook 2013 .

Distributed File Replication Service

The Distributed File Replication Service includes the Dfsrdiag.exe command-line tool. Dfsrdiag.exe can set the server RPC port that is used for administration and replication. To use Dfsrdiag.exe to set the server RPC port, follow this example:

dfsrdiag StaticRPC/port: nnnnn /Member: Branch01.sales.contoso.com

In this example, nnnnn represents a single, static RPC port that DFSR will use for replication. Branch01.sales.contoso.com represents the DNS or NetBIOS name of the target member computer. If no member is specified, Dfsrdiag.exe uses the local computer.

Internet Information Services

For information about ports in IIS 6.0, see TCP/IP Port Filtering .

For information about FTP, see the following resources:

  • FTP Publishing Service webpage
  • Configuring FTP Firewall Support

Multicast Address Dynamic Client Allocation Protocol (MADCAP)

For more information about how to plan MADCAP servers, see Checklist: Installing a MADCAP server .

For more information about the ports that are used by Microsoft Message Queuing, see TCP ports, UDP ports, and RPC ports that are used by Message Queuing .

Microsoft Operations Manager

For information about how to plan for and to deploy MOM, see System Center Developer Documentation Library .

For more information about how to configure the port that is used by RDS, see Change the listening port for Remote Desktop on your computer .

Controlling communications over the Internet in Windows

For more information, see the Using Windows Server 2003 with Service Pack 1 in a Managed Environment: Controlling Communication with the Internet .

For information about the ports that are used by Windows Media Services, see Allocating Ports for Windows Media Services .

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List of TCP Ports and UDP Ports (Well-Known)

Numbered 0 Through 1023

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  • Wi-Fi & Wireless

The  Transmission Control Protocol (TCP)  and User Datagram Protocol (UDP) each use port numbers for their communication channels. The ports numbered 0 through 1023 are the  well-known   system ports , reserved for special uses. 

Port 0  is not used for TCP/UDP communication although it used as a network programming construct. 

The Breakdown of Other System Ports

  • (TCP) TCPMUX - TCP Port Service Multiplexer . Allows any of multiple TCP services to be contacted by their service name. See RFC 1078.
  • (TCP)  Management Utility . Formerly used by the Compressnet product, for compression of TCP WAN traffic.
  • (TCP)  Compression Process . Formerly used by Compressent for compression of TCP WAN traffic.
  • (TCP/UDP) Unassigned
  • (TCP/UDP) Remote Job Entry . Mechanism for executing batch jobs remotely. See RFC 407.
  • (TCP/UDP)  Echo.  When enabled for debugging purposes, returns to the source any data received. See RFC 862.
  • (TCP/UDP)  Discard . When enabled for debugging purposes, throws away any data received with no response sent. See RFC 86.
  • (TCP)  Active Users . Unix TCP systat. See RFC 866.
  • (TCP/UDP)  Daytime . See RFC 867.
  • (TCP/UDP) Unassigned. Formerly reserved for Unix netstat.
  • (TCP/UDP) Unassigned.
  • (TCP/UDP)  Quote of the Day . For Unix qotd. See RFC 865.
  • (TCP) Message Send Protocol (formerly) and Remote Write Protocol . (UDP)  Remote Wire Protocol . See RFC 1312 and RFC 1756.
  • (TCP/UDP)  Character Generator Protocol . See RFC 864.
  • (TCP)  File Transfer . For FTP data.
  • (TCP)  File Transfer . For FTP control.
  • (TCP)  SSH Remote Login Protocol . (UDP)  pcAnywhere .
  • (TCP) Telnet
  • (TCP/UDP) For private mail systems.
  • (TCP)  Simple Mail Transfer Protocol (SMTP) . See RFC 821.
  • (TCP/UDP)  ESMTP . POP mail service of SLMail.
  • (TCP/UDP)  MSG ICP .
  • (TCP/UDP) MSG Authentication
  • (TCP/UDP) Unassigned
  • (TCP/UDP)  Display Support Protocol
  • (TCP/UDP) For private printer servers.
  • (TCP/UDP)  Time Protocol . See RFC 868.
  • (TCP/UDP)  Route Access Protocol (RAP) . See RFC 1476.
  • (UDP) Resource Location Protocol . See RFC 887.
  • (TCP/UDP)  Graphics
  • (UDP) Host Name Server - Microsoft WINS
  • (TCP) WHOIS . Also known as NICNAME. RFC 954.
  • (TCP) MPM FLAGS Protocol
  • (TCP) Message Processing Module (receive)
  • (TCP) Message Processing Module (send)
  • (TCP/UDP)  NI FTP
  • (TCP/UDP)  Digital Audit Daemon
  • (TCP) Login Host Protocol . Also known as TACACS. See RFC 927 and RFC 1492.
  • (TCP/UDP)  Remote Mail Checking Protocol (RMCP) . See RFC 1339.
  • (TCP/UDP)  IMP Logical Address Maintenance
  • (TCP/UDP)  XNS Time Protocol
  • (TCP/UDP)  Domain Name Server (DNS)
  • (TCP/UDP)  XNS Clearinghouse
  • (TCP/UDP)  ISI Graphics Language
  • (TCP/UDP)  XNS Authentication
  • (TCP/UDP) private terminal access. For example, TCP Mail Transfer Protocol (MTP). See RFC 772 and RFC 780.
  • (TCP/UDP) XNS Mail
  • (TCP/UDP) private file services. For example, NFILE. See RFC 1037.
  • (TCP/UDP)  NI Mail
  • (TCP/UDP)  ACA Services
  • (TCP/UDP)  Whois and Network Information Lookup Service . Also known as Whois++. See RFC 1834.
  • (TCP/UDP)  Communications Integrator
  • (TCP/UDP)  TACACS Database Service
  • (TCP/UDP)  Oracle SQL*NET
  • (TCP/UDP)  Bootstrap Protocol Server . (UDP) Unofficially, Dynamic Host Configuration Protocol (DHCP) servers use this port.
  • (TCP/UDP)  Bootstrap Protocol Client (BOOTP) . See RFC 951. (UDP) Unofficially, DHCP clients use this port.
  • (TCP/UDP)  Trivial File Transfer Protocol (TFTP) . See RFC 906 and RFC 1350.
  • (TCP/UDP)  Gopher . See RFC 1436.
  • (TCP/UDP)  Remote Job Service
  • (TCP/UDP) private dial-out services
  • (TCP/UDP)  Distributed External Object Store
  • (TCP/UDP) private remote job execution services
  • (TCP/UDP)  Vettcp Service
  • (TCP/UDP)  Finger User Information Protocol . See RFC 1288.
  • (TCP) Hypertext Transfer Protocol (HTTP) . See RFC 2616.
  • (TCP/UDP)  HOSTS2 Name Server
  • (TCP/UDP)  XFER Utility
  • (TCP/UDP)  MIT ML Device
  • (TCP/UDP)  Common Trace Facility
  • (TCP/UDP)  Micro Focus COBOL
  • (TCP/UDP) private terminal links
  • (TCP/UDP)  Kerberos Network Authentication Service . See RFC 1510.
  • (TCP/UDP)  SU/MIT Telnet Gateway
  • (TCP/UDP)  DNSIX Security Attribute Token Map
  • (TCP/UDP)  MIT Dover Spooler
  • (TCP/UDP)  Network Printing Protocol
  • (TCP/UDP)  Device Control Protocol
  • (TCP/UDP)  Tivoli Object Dispatcher
  • (TCP/UDP)  SUPDUP Display Protocol . See RFC 734.
  • (TCP/UDP)  DIXIE Protocol . See RFC 1249.
  • (TCP/UDP)  Swift Remote Virtual File Protoc ol
  • (TCP/UDP)  TAC News . Unofficially used today by Linux utility linuxconf.
  • (TCP/UDP)  Metagram Relay

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About TCP/UDP Ports

  • Port 0 to 1023: These TCP/UDP port numbers are considered as well-known ports. These ports are assigned to specific server sevice by the Internet Assigned Numbers Authority (IANA). For example, port 80 is used by web servers.
  • Port 1024 to 49151: These are ports that an organization, such as application developers, can register with IAMA to be used for a particular service. These should be treated as semi-reserved.
  • Port 49152 to 65535: These are port numbers used by client programs, such as a web browser. When you visit a web site, your web browser will assign that session a port number from within this range. As an application developer, you are free to use any of these ports.

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Security+ Ports

If you’re planning to take the CompTIA Security+ SY0-401 exam you should have many of the well-known ports memorized. Objective 1.5 “Identify commonly used default network ports” for the CompTIA Security+ exam lists several protocols and you should know the ports used for each of these.

If you understand ports, skip ahead to the relative tables .

Well Known Ports

Well known port numbers are matched to specific protocols and when you see the port, you should be able to identify the protocol. Sometimes you may be given the protocol and be required to identify the port. There are 1024 well known TCP and UDP ports (numbered 0 through 1023) but you don’t need to memorize them all. You should know the ports in the tables on this page.

Logical Ports

The well-known ports are logical ports and have nothing to do with physical ports. For example, TCP port 80 is the port used for Hypertext Transfer Protocol (HTTP) and TCP port 443 is the port used for Hypertext Transfer Protocol Secure (HTTPS).

In contrast, a physical port on a switch or router is used to make a physical connection between devices. You can touch the physical port while the logical port is simply a number embedded in the packet.

Every packet has both a source port and a destination port along with a source IP address and a destination IP address. The IP address is used to get the packet to the destination system and when the packet is received, TCP/IP uses the port information to determine how to handle the packet. This blog on  Understanding Ports for Security+ describes the process of how logical ports are used in more detail.

TCP and UDP

Each of these logical ports are technically identified as either a Transmission Control Protocol (TCP) port or a User Datagram Protocol (UDP) port depending on which transport protocol they use. When preparing for the Security+ exam, you should be aware of some of the protocols that use UDP instead of TCP.

If the protocol requires the benefits of TCP such as guaranteed delivery, it will use the TCP port. For example, web traffic using Hypertext Transfer Protocol (HTTP) uses TCP because web pages will not display properly if some of the packets aren’t received. TCP tracks all the packets and if one is lost, it sends a request to have it resent. This takes a little longer, but provides the assurance that all packets are received.

Some protocols use only the UDP port. For example, Trivial File Transport Protocol (TFTP) uses UDP port 69 but not TCP port 69.

Other protocols will use both TCP and UDP, depending on the purpose. For example, Domain Name System (DNS) will normally use UDP port 53 when responding to typical name resolution requests from clients. However, when one DNS server is transferring data to another DNS server, it will typically use TCP port 53.

The tables on this page specify whether a protocol uses TCP, UDP, or both.  If you want to know specifically which transport protocol is used for other protocols, check out Wikipedia’s list of TCP and UDP port numbers .

Interestingly, Internet Assigned Numbers Authority (IANA) previously identified which transport protocol was used for each port in their Service Name and Transport Protocol Port Number Registry . However, they seem to have defaulted to just listing both TCP and UDP for each port. For example, Telnet (defined in RFC 854 ) only uses TCP port 23, not UDP. However, IANAs port number registry lists both TCP and UDP for Telnet.

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Test your readiness  with these quality questions. Understand the important concepts using the explanations.

If you’re like most people, you’ve already spent money on one or more Network+ books or courses. Now you need to ensure you understand the concepts and how they are tested. You can pay $100 or more for practice test questions, but you don’t need to.

The set of practice test questions will give you a view of typical questions you can expect to see on the live exam.

You don’t need to spend a fortune to get quality practice test questions.

Practice Test Question

When you know the ports and understand the protocols, questions are much easier to answer. For example, consider this practice test question:

Q. What port do you need to close to block outgoing email?

A. TCP port 22

B. TCP port 25

C. TCP port 110

D. TCP port 443

Answer at the end of the blog.

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Will You Be Tested on Ports?

It’s entirely possible that if you take the time to memorize these ports, you might not get any questions on them. It’s rare, but some test takers report not seeing a single question on ports. However, this knowledge is still valuable to you in the field.

It’s also entirely possible that if you don’t memorize them, you’ll get ten questions on ports and drop the exam due to this lack of knowledge. With this in mind, it’s worth your time to memorize these ports. If you’re tested on them, the questions will be “gimme” questions that you’ll breeze through easily.

When preparing for the Security+ SY0-401 exam, you should know the ports in the following tables. They are organized based on usage.

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File transfer ports.

The ports in this table are used with protocols that transfer files.

Email Ports

The ports in this table are used with email related protocols.

Master Security+ Performance Based Questions Video

Remote Access Ports

The ports in this table are associated with protocols used to connect to remote computers for various purposes.

Miscellaneous Ports

The ports in this table don’t fit neatly in any of the other categories but are still relevant.

Practice Test Question Answer

C. Port 110

D. Port 443

TCP port 25 is used for SMTP and SMTP is used for outgoing email.

TCP port 22 is used for SSH, SFTP, and SCP but not for email.

TCP port 110 is used for POP3 but POP3 is only used for incoming email, not outgoing email.

TCP port 443 is used for HTTPS, not email.

There are 1024 well known TCP and UDP ports, numbered 0 through 1023. You don’t need to memorize them all but you should know some of the common port numbers when preparing for the Security+ exam. You should also know which protocols have a preference of TCP over UDP. These concepts are covered in more depth in the CompTIA Security+: Get Certified Get Ahead- SY0-401 Practice Test Questions.

Other Security+ Study Resources

  • Security+ blogs organized by categories
  • Security+ blogs with free practice test questions
  • Security+ blogs on new performance-based questions
  • Mobile Apps: Apps for mobile devices running iOS or Android
  • Audio Files:  Learn by listening with over 6 hours of audio on Security+ topics
  • Flashcards:  494 Security+ glossary flashcards, 222 Security+ acronyms flashcards and 223 Remember This slides 
  • Quality Practice Test Questions:  Over 300 quality Security+ practice test questions with full explanations
  • Full Security+ Study Packages:   Quality practice test questions, audio, and Flashcards

SY0-601 Practice Test Questions 

Over 385 realistic Security+ practice test questions

At least 10 performance-based questions

All questions include explanations so you’ll know why the correct answers are correct,

and why the incorrect answers are incorrect.

Upgrade Your Resume with the Security+ New Version

  • Learn mode – randomized . View each of the questions in random order. Learn mode allows you to keep selecting answers until you select the correct answer. Once you select the correct answer, you’ll see the explanation. Click  here to see how learn mode works .
  • Test mode – randomized . View each of the questions in random order. In test mode, you can only see the correct answers and explanations after you complete the test. Click  here to see how test mode works .
  • Test mode – 75 random questions . View 75 random questions from the full test bank similar to how the Security+ exam has a potential maximum of 75 multiple choice questions.

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Click here if you’re looking for SY0-501 Online Study Package

10 thoughts on “ Security+ Ports ”

A colleague took the exam today. And passed. One bit of info he shared was on his exam, knowing xxx wasn’t enough. The question wanted to know what xxx.

That comment is a little too specific and violates the CompTIA NDA and testing policies. Posting it here can get both of us in trouble.

However, the content is covered in the CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide in chapter 4 .

I see that you purchased practice test questions on the gcgapremium.com site . If you take all of those questions, you’ll see that the content is covered there too.

Good luck on exam day.

Hello, I just had a question regarding SYS401.

I noticed that in your textbook Security+ Get Certified Get Ahead, there is a table 3.1 that shows a list of well known ports. I’ve seen a list created by others that seemed much more extensive than the one you had. I was wondering just for the purpose of this exam, Security+, is the table listed in your textbook sufficient?

Thank you in advanced!

You’re referring to table 3.1 in the CompTIA Security+: Get Certified Get Ahead: SY0-401 Study Guide . It has been sufficient for many.

I’ve also added some questions with different ports and protocol IDs to some of the online packages .

Hi Darril, I’m taking my Security+ exam this Thursday afternoon. In preparing for the Performance Based questions where you have to configure an ACL for a firewall, I”m a little confused regarding which ports are TCP and which are UDP. For example, in your chart above you list DNS which is port 53 as using TCP and UPD. I have your book as well as another book by Emmett Dulaney (CompTIA Security+ Study Guide, Fifth Edition), and in his book (page 37) he lists DNS as being port 53 UPD only. I’m concerned that on the exam I won’t know if a port is TCP, UPD, or both.

Also, for configuring the firewall ACL, if a port uses both TCP and UPD, would you have to list a line in the ACL for TCP and a line for TCP? Would you also have to list Deny all at then end for implicit deny. This question relates to the exam.

DNS uses both TCP and UDP. Queries to DNS for name resolution use UDP. However, when DNS servers transfer information between each other they use TCP.

Can you tell me how to adjust the seat position on any car I might drive? You probably could, but there isn’t a single answer that covers them all. Instead, different car seats have different methods of adjusting them.

Similarly, different firewalls have different methods.

Some firewalls require separate allow lines in the ACL for both TCP and UDP. Others allow you to create a single line for a port using any protocol.

Some firewalls require you to add a Deny All line at the end to enforce an implicit deny strategy. Other firewalls have this line built in and even when you don’t add the line, the firewall still enforces it.

Thanks for the list but I have a small issue regarding FTPS. From my research I thought FTPS uses either (TCP) 989 and (TCP) 990 (implicit mode) or Port 21 and 20 (via explicit mode)? But you have listed TCP 443? I’m confused?

This is one of those questions that really doesn’t have a right answer but from the perspective of the Security+ exam, there is a “correct” answer. This blog focuses on what you need for Security+.

In the CompTIA Security+: Get Certified Get Ahead: SY0-301 Study Guide, I mention that “FTP uses port 20 for data and port 21 for control signals” and “some implementations of FTPS use ports 989 and 990.”

FTPS uses SSL and SSL is commonly associated with port 443.

Consider these three questions:

Q. What port(s) does FTPS use? A. 443 B. 1 C. 2 D. 3 Obviously, to get the answer correct, you’d choose A though some people might disagree with the accuracy of the answer.

Q. What port(s) does FTPS use? A. 989 and 990 B. 1 C. 2 D. 3 Obviously, to get the answer correct, you’d choose A though some people might suggest that the question should state “implicit mode.”

Q. What port(s) does FTPS use? A. 20 and 21 B. 1 C. 2 D. 3 Obviously, to get the answer correct, you’d choose A though some people might suggest that the question should state “explicit mode.”

All that said, your level of knowledge has expanded beyond what you need for the Security+ exam. If you move into the SSCP or CISSP exam, this extra knowledge is useful but I’d suggest you don’t let it stop you from seeing the “simple” answers on the Security+ exam.

I just passed the Security + exam this morning in GA. I was presented the 70 question bank and the first 7 questions were simulations. Of the 7, the first 3 were straight forward port-related. The other 4 were much more detailed in an effort to test your network and configuration savvy. Flag them and come back. You will need the time, believe me. Darril, your book and plenty of practice test were all that was needed in a committed 2 to 3 month plan from scratch. Thank you. Where can I go from here to develop and hone my security skills?

Congratulations on the pass. Great to hear the book helped.

Many people pursue the SSCP exam after the Security+. Here’s a resource that might help: http://www.amazon.com/Systems-Security-Certified-Practitioner-Guide/dp/0071771565

Congratulations again, and good luck in your next adventure.

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TCP UDP Ports

Port 500 is used for Internet Security Association and Key Management Protocol (ISAKMP) or Internet Key Exchange (IKE) traffic. It is mainly used for setting up a secure communication channel between two devices in a Virtual Private Network (VPN).

Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.

Unofficialy or sometimes with conflict, the same port may be used by different applications.

TCP UDP Ports

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Common Ports Cheat Sheet: The Ultimate List

Common Ports Cheat Sheet

Perhaps you’re angsty that you’ve forgotten what a certain port number meant. Rest assured, you don’t have to remember all 65,535 port numbers. With so much information to remember, it’s understandable if you forget a common port. That’s why we put together this cheat sheet of common network ports for you.

A crucial domain of expertise in IT-related certifications such as Cisco Certified Network Associate (CCNA) and those of CompTIA is port numbers and associated services , which this common ports and protocols cheat sheet covers. If you want to remember a port number or protocol, this cheat sheet will help everyone, from students to professionals.

Get a copy of this common ports cheat sheet here to keep on your desk. When you're ready, scroll below to find the port you’re looking for.

Common Ports Cheat Sheet Search

Search our Common Ports cheat sheet to find the right cheat for the term you're looking for. Simply enter the term in the search bar and you'll receive the matching cheats available.

Common Ports and Protocols Cheat Sheet

The following tables cover services (and malware) that use common TCP ports and some UDP or SCTP ports.

Well-known/System Ports: 0 – 1023

Registered ports: 1024 – 49151, dynamic/private ports: 49152 – 65535.

You may use these ports for custom applications free from concerns that it may clash with existing processes.

The Most Common Ports for Exams

If you’re studying for IT certifications such as CCNA , focus on these ports:

We hope that you found this cheat sheet useful. Familiarity with ports and protocols is vital to building secure applications and troubleshooting problems on computer networks. Whether you're studying or working, this cheat sheet of common network ports will help you in academic and professional settings.

For further resources, or if you’re curious about how ports and protocols fit into cyber security, look into network security courses available with our StationX Accelerator Program .

Frequently Asked Questions

FTP: ports 20-21; SSH/SCP: port 22; HTTP: 80; HTTPS: 443; POP3: 110; POP3 over SSL: 995; IMAP: 143; IMAP over SSL: 993. We recommend you download the graphic in Well-known/System Ports .

It depends on whether you’re referring to system ports (1024) or want to include ports registered with apps (49152) because system ports range from 0 through 1023, and registered ports span 1024 – 49151.

FTP: ports 20-21; SSH/SCP: port 22; Telnet: 23; SMTP: 25; DNS: 53; HTTP: 80; POP3: 110; IMAP: 143; HTTPS: 443.

FTP: port 21; SSH/SCP: 22; Telnet: 23; SMTP: 25; DNS: 53; POP3: 110; IMAP: 145; HTTP: 80; HTTPS: 443; MySQL: 3306; RDP: 3389; VNC: 5900.

The following are the three types of ports with corresponding port number ranges: • Well-known/System ports: 0 – 1023 • Registered ports: 1024 – 49151 • Dynamic/Private ports: 49152 – 65535

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Nathan House is the founder and CEO of StationX. He has over 25 years of experience in cyber security, where he has advised some of the largest companies in the world. Nathan is the author of the popular "The Complete Cyber Security Course", which has been taken by over half a million students in 195 countries. He is the winner of the AI "Cyber Security Educator of the Year 2020" award and finalist for Influencer of the year 2022.

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Nathan, thank you for supplying this sheet. It comes in handy when you’re trying to remember what a particular port is used by.

Our pleasure.

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Thank you, Nathan

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This is a great single point to reference all default ports. Thank you!!!

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Very good, it will be in front of me!

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Ports on computers are required for networking, and without them, the computer would be completely isolated and it would be unable to communicate with other devices. So thank you for proving this list of the Common TCP and UDP Port numbers.

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After resetting my router cause the password got changed and all the setting were changed to gain access to my computer. I spent about 20 minutes setting up the router. It appears the router never got set up from the cable company when it was installed. So if you have not done so lately check your router and settings.

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Cool, Thanks for sharing!!

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Sorry Nathan, i did not leave a comment for this “Common Ports” Chart last-week. I am glad i signed up to your news letter you are a good researcher. thank you for sharing with us all..

' src=

Nathan, I must thank you for these cheat sheets! They’ve been great on my learning and certification journey!

Thank you too!

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Really really useful.Thanks a lot!!

' src=

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NetworkProGuide

Common Ports Cheat Sheet

We are reader supported. We may earn a comission if you use links on our site. Learn more.

It’s a pain trying to memorize port numbers and their corresponding service names and protocols. So, we created this concise cheat sheet of common network ports and their associated protocols and service names for you to use as a quick reference.

Feel free to print it out and hang it up or share a link to it with your colleagues and peers. Use it to speed up port identification or as a training resource for onboarding new network administrators or engineers.

Free Common Port Cheat Sheet

Preview of cheat sheet listing common ports and their associated protocols in computer networking.

Click on the network port chart above to view the printable, searchable PDF version. Scroll down below for the port list tables.

This list is by no means exhaustive. It just lists the most frequently used ports. There are a total of 65,535 TCP/UDP ports. They are divided into 3 classes:

  • Well Known Ports (1-1023) – Reserved ports registered with IANA for specific services.
  • Registered Ports (1024-49151) – Also registered with IANA but not as commonly used.
  • Dynamic/Private Ports (49152-65535) – Reserved by IANA for proprietary services or private use.

IANA (Internet Assigned Numbers Authority), in case you’re wondering, is the organization that oversees global IP address allocation and port classification.

Some common protocols that use these ports:

  • TCP (Transmission Control Protocol)
  • UDP (User Datagram Protocol) – Only one port needed for bidirectional traffic
  • SCTP (Stream Control Transmission Protocol)
  • DCCP (Datagram Congestion Control Protocol)

Common Well-known/System Ports in Computer Networking

Well-known network ports range from 0 to 1023. These ports are assigned by IANA and listed in RFC 1700 . On most systems they can only be used by system (or root) processes or by programs executed by privileged users. Some well-known ports use TCP, some use UDP, and some can be configured to use either. 

Well-known TCP ports are used by applications that rely on TCP as the transport protocol. Examples:

  • FTP (File Transport Protocol) uses TCP ports 20 and 21
  • Telnet uses TCP port 23

Well-known UDP ports are used by applications relying on UDP. Examples:

  • TFTP (Trivial File Transport Protocol) uses UDP port 69
  • SNMP uses UDP port 161 for messages and UDP port 162 for traps

Knowledge of these ports is helpful for network engineers looking for work as they are popular topics asked about in technical interviews.

Common Registered Network Ports

Registered network ports are ports in the range of 1024 to 49151 that have been officially registered with the Internet Assigned Numbers Authority (IANA) for specific services and applications.

Some key points about registered ports:

  • They come after well-known ports (0-1023) and before dynamic/private ports (49152-65535).
  • Anyone can register a port in this range with IANA for their application/service.
  • Registration ensures the port number is standardized and should not be used by other services.
  • Examples include port 3306 for MySQL, port 1521 for Oracle database, port 1723 for PPTP.
  • Not as commonly used as well-known ports, but still important for avoiding conflicts.
  • Provide an official way to allocate ports for proprietary applications and organizational services.
  • The full list of registered ports is maintained by IANA and published on their website.
  • Helpful for network administration to know what traffic these registered ports are associated with.

Common Dynamic/Private Network Ports

Dynamic/Private network ports refer to the range of ports from 49152 to 65535 that are not officially registered with IANA for any specific service or application and are available for private or temporary use. 

They can be used by applications dynamically as needed, usually for establishing temporary connections. Often they are used by client-side applications that initiate connections to servers on well-known or registered ports. 

A common example of dynamic network port use is Ephemeral Ports. These are short-lived transport layer ports used when an application on a client device makes an outgoing connection to a server. They allow a client application to use a random available port for its side of the connection which has multiple benefits from enabling multiple connections from the same client application to traversing firewalls as most firewalls are configured by default to allow connections from ephemeral ports to well-known ports.

The dynamic/private port range also provides ports for private or customized services within an organization since they are unregistered.

Top 35 Most Common Ports for Certification Exams and Interviews

Prepping for an exam or interviewing for a role in networking or a networking adjacent field? Prioritize memorizing the ports below.

In my experience, these are the ports most frequently used in certification exams and to quiz candidates in technical interviews.

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How Does Internet Work

Tcp and udp port numbers – complete list.

This is a list of Internet socket port numbers used by application communication with TCP and UDP on the Transport Layer of the Internet Protocol Suite for the host-to-host communications.

Let’s see who makes it possible? The Internet Assigned Numbers Authority (IANA) assigns all port numbers except Dynamic or Private ports. IANA is a standards organization in the world that is responsible for assigning various addressing standards.

There are different types of port numbers: Well Known Ports (Numbers 0 to 1023), Registered Ports (Numbers 1024 to 49151) and Dynamic or Private Ports (Numbers 49152 to 65535). The last porn number type  Dynamic or Private Ports  will not appear on our list because they are cannot be registered with IANA. This range is used for custom or temporary purposes and for automatic allocation of ephemeral ports. They are usually assigned dynamically to client applications when initiating a connection. It is not very common for a client to connect to a service using a Dynamic or Private Port, sometimes some peer-to-peer file sharing programs do.

We will introduce the list of the ports with short description of different port types.

Using both TCP and UDP is also normal sometime. Some applications may use both TCP and UDP. For example, the low overhead of UDP with his short header enables DNS to serve many client requests very quickly. However, sending the requested information sometimes may require the reliability of TCP. In that case, the port number of 53 that is a well known port number is used by both protocols with this service.

Let’s see the list of port numbers:

  • Well-known ports
  • Registered Ports

Well Known Ports (Numbers 0 to 1023) – These numbers are reserved for services and applications. They are commonly used for applications such as HTTP (web server) POP3/SMTP (e-mail server) and Telnet. By defining these well-known ports for server applications, client applications can be programmed to request a connection to that specific port and its associated service.

Registered Ports >> Registered Ports

Registered Ports (Numbers 1024 to 49151) – These port numbers are assigned to user processes or applications. These processes are primarily individual applications that a user has chosen to install rather than common applications that would receive a Well Known Port. When not used for a server resource, these ports may also be used dynamically selected by a client as its source port.

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This is very helpful. Thank you for the information! You may want to change a word in the sentence (The last porn number type Dynamic or Private Ports.).

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List of TCP and UDP port numbers

Computer networking list / from wikipedia, the free encyclopedia, dear wikiwand ai, let's keep it short by simply answering these key questions:.

Can you list the top facts and stats about List of TCP and UDP port numbers?

Summarize this article for a 10 year old

This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex , bidirectional traffic. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist.

The Internet Assigned Numbers Authority (IANA) is responsible for maintaining the official assignments of port numbers for specific uses. [1] However, many unofficial uses of both well-known and registered port numbers occur in practice. Similarly, many of the official assignments refer to protocols that were never or are no longer in common use. This article lists port numbers and their associated protocols that have experienced significant uptake.

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UDP and TCP ports: A list of the most important ports

UDP and TCP ports: A list of the most important ports

TCP and UDP  are used to connect two devices over the Internet or other networks. However, to give data packages an entrance to the PC or server at the other end of the connection, the “doors” have to be open. These openings into the system are called ports. For both protocols, there are some known and important ports which you need to know when developing web apps.

What do ports do?

Well-known ports, registered ports.

When communicating via the Internet, the two protocols TCP and UDP establish the connection, compile data packages again after transfer, and then hand them over to the programs addressed on the recipient’s device. For this handover to work, the operating system must create entrances and open them for the transfer. Every entrance has a specific code number . After the transfer, the receiving system knows where the data has to be delivered based on the port number. The data package always includes two port numbers: the sender’s and the recipient’s.

Ports have consecutive numbers – from 0 to 65536. Some of these code numbers are standardized, which means they are assigned to specific applications . These standard ports are also called well-known ports, as the code numbers are known to all and permanently assigned. There are also registered ports, which organizations or software producers have registered for their applications. The Internet Assigned Numbers Authority (IANA) is responsible for registration. There is also a wide range of port numbers that are assigned dynamically. For example, browsers use these ports when visiting a website. The number is then free again afterwards.

List of the most important ports

Among the over 65,000 ports, there are few code numbers that are essential for Internet communication. We want to show you the most important well-known ports and registered ports. Some of these ports are only authorized for one of the two protocols (TCP or UDP). There are also ports that were not officially registered for the service in question, but have established themselves unofficially. Some ports have double assignments.

Ports numbered 49152 and higher are dynamic ports. They are not assigned by IANA. Any application can use these ports locally or globally in a dynamic way. As a result, it could easily be the case that one of these ports is already occupied.

Related articles

TCP/IP

Without TCP/IP protocols, you wouldn’t be able to read the words on this page. TCP and IP, the two foundational protocols of the suite, along with other related sets of rules, define how computers communicate over the Internet and other networks. In fact, the standards are so established that every device on the Internet follows these protocols to ensure the smooth transfer of data.

Remote procedure call (RPC) – efficient communication in client-server architectures

Remote procedure call (RPC) – efficient communication in client-server architectures

Due to increasing globalization, processes for connecting and networking digital infrastructures are becoming increasingly important. The remote procedure call (RPC) plays a key role in this context, as it enables efficient inter-process communication designed for task distribution in networked client-server architectures.

RPC server: what should you do if the RPC server is unavailable?

RPC server: what should you do if the RPC server is unavailable?

If the RPC server is unavailable, Windows will display the error code 0x800706BA. This means the network communication between the client and the server has been interrupted. The problem occurs fairly regularly in Windows 10. In this guide, we explain what the RPC server error message means and how you can fix it yourself without any expert network knowledge.

Network News Transfer Protocol (NNTP)

Network News Transfer Protocol (NNTP)

As a global computer network, the Internet provides the perfect foundation for gathering and distributing information. The World Wide Web, the most well-known Internet service, convincingly proves this fact. The older Usenet benefits from the Internet’s global network as well. In order to be able to transfer data, it relies on the unique NNTP, which is the focus of this article.

NTLM (NT LAN Manager)

NTLM (NT LAN Manager)

The NTLM protocol was a practical solution for Windows devices for a long time: A user just had to sign in once and then gain direct access to various network services. However, this authentication method is now considered unsafe and is no longer in use. How does NTLM work, and why do users now prefer to use Kerberos?

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port numbers 500

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Whilst the IP address provides the connection to the correct machine, it cannot distinguish the different service that is required. The port is used to distinguish the application. It is a value from 0 to 65535. The combination of IP address, port and protocol is called a socket, and has to be unique for every service. The port numbers area available for both TCP and UDP, and when referred to in conjunction with the IP address it specifies the "socket".

The first 1000 ports are reserved for specific applications, and on Linux can normally own be used by a daemon / application that has super user privileges. These are referred to as well known ports. Some are defined in RFC 1340, and more are defined by IANA.

Details of the reserved ports are listed on most systems in the /etc/services file, an example of which is shown below (taken from a Ubuntu Linux distribution).

/etc/services

# Network services, Internet style # # Note that it is presently the policy of IANA to assign a single well-known # port number for both TCP and UDP; hence, officially ports have two entries # even if the protocol doesn't support UDP operations. # # Updated from http://www.iana.org/assignments/port-numbers and other # sources like http://www.freebsd.org/cgi/cvsweb.cgi/src/etc/services . # New ports will be added on request if they have been officially assigned # by IANA and used in the real-world or are needed by a debian package. # If you need a huge list of used numbers please install the nmap package. tcpmux 1/tcp # TCP port service multiplexer echo 7/tcp echo 7/udp discard 9/tcp sink null discard 9/udp sink null systat 11/tcp users daytime 13/tcp daytime 13/udp netstat 15/tcp qotd 17/tcp quote msp 18/tcp # message send protocol msp 18/udp chargen 19/tcp ttytst source chargen 19/udp ttytst source ftp-data 20/tcp ftp 21/tcp fsp 21/udp fspd ssh 22/tcp # SSH Remote Login Protocol ssh 22/udp telnet 23/tcp smtp 25/tcp mail time 37/tcp timserver time 37/udp timserver rlp 39/udp resource # resource location nameserver 42/tcp name # IEN 116 whois 43/tcp nicname tacacs 49/tcp # Login Host Protocol (TACACS) tacacs 49/udp re-mail-ck 50/tcp # Remote Mail Checking Protocol re-mail-ck 50/udp domain 53/tcp # Domain Name Server domain 53/udp mtp 57/tcp # deprecated tacacs-ds 65/tcp # TACACS-Database Service tacacs-ds 65/udp bootps 67/tcp # BOOTP server bootps 67/udp bootpc 68/tcp # BOOTP client bootpc 68/udp tftp 69/udp gopher 70/tcp # Internet Gopher gopher 70/udp rje 77/tcp netrjs finger 79/tcp http 80/tcp www # WorldWideWeb HTTP http 80/udp # HyperText Transfer Protocol link 87/tcp ttylink kerberos 88/tcp kerberos5 krb5 kerberos-sec # Kerberos v5 kerberos 88/udp kerberos5 krb5 kerberos-sec # Kerberos v5 supdup 95/tcp hostnames 101/tcp hostname # usually from sri-nic iso-tsap 102/tcp tsap # part of ISODE acr-nema 104/tcp dicom # Digital Imag. & Comm. 300 acr-nema 104/udp dicom csnet-ns 105/tcp cso-ns # also used by CSO name server csnet-ns 105/udp cso-ns rtelnet 107/tcp # Remote Telnet rtelnet 107/udp pop2 109/tcp postoffice pop-2 # POP version 2 pop2 109/udp pop-2 pop3 110/tcp pop-3 # POP version 3 pop3 110/udp pop-3 sunrpc 111/tcp portmapper # RPC 4.0 portmapper sunrpc 111/udp portmapper auth 113/tcp authentication tap ident sftp 115/tcp uucp-path 117/tcp nntp 119/tcp readnews untp # USENET News Transfer Protocol ntp 123/tcp ntp 123/udp # Network Time Protocol pwdgen 129/tcp # PWDGEN service pwdgen 129/udp loc-srv 135/tcp epmap # Location Service loc-srv 135/udp epmap netbios-ns 137/tcp # NETBIOS Name Service netbios-ns 137/udp netbios-dgm 138/tcp # NETBIOS Datagram Service netbios-dgm 138/udp netbios-ssn 139/tcp # NETBIOS session service netbios-ssn 139/udp imap2 143/tcp imap # Interim Mail Access P 2 and 4 imap2 143/udp imap snmp 161/tcp # Simple Net Mgmt Protocol snmp 161/udp snmp-trap 162/tcp snmptrap # Traps for SNMP snmp-trap 162/udp snmptrap cmip-man 163/tcp # ISO mgmt over IP (CMOT) cmip-man 163/udp cmip-agent 164/tcp cmip-agent 164/udp mailq 174/tcp # Mailer transport queue for Zmailer mailq 174/udp xdmcp 177/tcp # X Display Mgr. Control Proto xdmcp 177/udp nextstep 178/tcp NeXTStep NextStep # NeXTStep window nextstep 178/udp NeXTStep NextStep # server bgp 179/tcp # Border Gateway Protocol bgp 179/udp prospero 191/tcp # Cliff Neuman's Prospero prospero 191/udp irc 194/tcp # Internet Relay Chat irc 194/udp smux 199/tcp # SNMP Unix Multiplexer smux 199/udp at-rtmp 201/tcp # AppleTalk routing at-rtmp 201/udp at-nbp 202/tcp # AppleTalk name binding at-nbp 202/udp at-echo 204/tcp # AppleTalk echo at-echo 204/udp at-zis 206/tcp # AppleTalk zone information at-zis 206/udp qmtp 209/tcp # Quick Mail Transfer Protocol qmtp 209/udp z3950 210/tcp wais # NISO Z39.50 database z3950 210/udp wais ipx 213/tcp # IPX ipx 213/udp imap3 220/tcp # Interactive Mail Access imap3 220/udp # Protocol v3 pawserv 345/tcp # Perf Analysis Workbench pawserv 345/udp zserv 346/tcp # Zebra server zserv 346/udp fatserv 347/tcp # Fatmen Server fatserv 347/udp rpc2portmap 369/tcp rpc2portmap 369/udp # Coda portmapper codaauth2 370/tcp codaauth2 370/udp # Coda authentication server clearcase 371/tcp Clearcase clearcase 371/udp Clearcase ulistserv 372/tcp # UNIX Listserv ulistserv 372/udp ldap 389/tcp # Lightweight Directory Access Protocol ldap 389/udp imsp 406/tcp # Interactive Mail Support Protocol imsp 406/udp svrloc 427/tcp # Server Location svrloc 427/udp https 443/tcp # http protocol over TLS/SSL https 443/udp snpp 444/tcp # Simple Network Paging Protocol snpp 444/udp microsoft-ds 445/tcp # Microsoft Naked CIFS microsoft-ds 445/udp kpasswd 464/tcp kpasswd 464/udp saft 487/tcp # Simple Asynchronous File Transfer saft 487/udp isakmp 500/tcp # IPsec - Internet Security Association isakmp 500/udp # and Key Management Protocol rtsp 554/tcp # Real Time Stream Control Protocol rtsp 554/udp nqs 607/tcp # Network Queuing system nqs 607/udp npmp-local 610/tcp dqs313_qmaster # npmp-local / DQS npmp-local 610/udp dqs313_qmaster npmp-gui 611/tcp dqs313_execd # npmp-gui / DQS npmp-gui 611/udp dqs313_execd hmmp-ind 612/tcp dqs313_intercell # HMMP Indication / DQS hmmp-ind 612/udp dqs313_intercell qmqp 628/tcp qmqp 628/udp ipp 631/tcp # Internet Printing Protocol ipp 631/udp # # UNIX specific services # exec 512/tcp biff 512/udp comsat login 513/tcp who 513/udp whod shell 514/tcp cmd # no passwords used syslog 514/udp printer 515/tcp spooler # line printer spooler talk 517/udp ntalk 518/udp route 520/udp router routed # RIP timed 525/udp timeserver tempo 526/tcp newdate courier 530/tcp rpc conference 531/tcp chat netnews 532/tcp readnews netwall 533/udp # for emergency broadcasts gdomap 538/tcp # GNUstep distributed objects gdomap 538/udp uucp 540/tcp uucpd # uucp daemon klogin 543/tcp # Kerberized `rlogin' (v5) kshell 544/tcp krcmd # Kerberized `rsh' (v5) dhcpv6-client 546/tcp dhcpv6-client 546/udp dhcpv6-server 547/tcp dhcpv6-server 547/udp afpovertcp 548/tcp # AFP over TCP afpovertcp 548/udp idfp 549/tcp idfp 549/udp remotefs 556/tcp rfs_server rfs # Brunhoff remote filesystem nntps 563/tcp snntp # NNTP over SSL nntps 563/udp snntp submission 587/tcp # Submission [RFC4409] submission 587/udp ldaps 636/tcp # LDAP over SSL ldaps 636/udp tinc 655/tcp # tinc control port tinc 655/udp silc 706/tcp silc 706/udp kerberos-adm 749/tcp # Kerberos `kadmin' (v5) # webster 765/tcp # Network dictionary webster 765/udp rsync 873/tcp rsync 873/udp ftps-data 989/tcp # FTP over SSL (data) ftps 990/tcp telnets 992/tcp # Telnet over SSL telnets 992/udp imaps 993/tcp # IMAP over SSL imaps 993/udp ircs 994/tcp # IRC over SSL ircs 994/udp pop3s 995/tcp # POP-3 over SSL pop3s 995/udp # # From ``Assigned Numbers'': # #> The Registered Ports are not controlled by the IANA and on most systems #> can be used by ordinary user processes or programs executed by ordinary #> users. # #> Ports are used in the TCP [45,106] to name the ends of logical #> connections which carry long term conversations. For the purpose of #> providing services to unknown callers, a service contact port is #> defined. This list specifies the port used by the server process as its #> contact port. While the IANA can not control uses of these ports it #> does register or list uses of these ports as a convienence to the #> community. # socks 1080/tcp # socks proxy server socks 1080/udp proofd 1093/tcp proofd 1093/udp rootd 1094/tcp rootd 1094/udp openvpn 1194/tcp openvpn 1194/udp rmiregistry 1099/tcp # Java RMI Registry rmiregistry 1099/udp kazaa 1214/tcp kazaa 1214/udp nessus 1241/tcp # Nessus vulnerability nessus 1241/udp # assessment scanner lotusnote 1352/tcp lotusnotes # Lotus Note lotusnote 1352/udp lotusnotes ms-sql-s 1433/tcp # Microsoft SQL Server ms-sql-s 1433/udp ms-sql-m 1434/tcp # Microsoft SQL Monitor ms-sql-m 1434/udp ingreslock 1524/tcp ingreslock 1524/udp prospero-np 1525/tcp # Prospero non-privileged prospero-np 1525/udp datametrics 1645/tcp old-radius datametrics 1645/udp old-radius sa-msg-port 1646/tcp old-radacct sa-msg-port 1646/udp old-radacct kermit 1649/tcp kermit 1649/udp groupwise 1677/tcp groupwise 1677/udp l2f 1701/tcp l2tp l2f 1701/udp l2tp radius 1812/tcp radius 1812/udp radius-acct 1813/tcp radacct # Radius Accounting radius-acct 1813/udp radacct msnp 1863/tcp # MSN Messenger msnp 1863/udp unix-status 1957/tcp # remstats unix-status server log-server 1958/tcp # remstats log server remoteping 1959/tcp # remstats remoteping server cisco-sccp 2000/tcp # Cisco SCCP cisco-sccp 2000/udp search 2010/tcp ndtp pipe-server 2010/tcp pipe_server nfs 2049/tcp # Network File System nfs 2049/udp # Network File System gnunet 2086/tcp gnunet 2086/udp rtcm-sc104 2101/tcp # RTCM SC-104 IANA 1/29/99 rtcm-sc104 2101/udp gsigatekeeper 2119/tcp gsigatekeeper 2119/udp gris 2135/tcp # Grid Resource Information Server gris 2135/udp cvspserver 2401/tcp # CVS client/server operations cvspserver 2401/udp venus 2430/tcp # codacon port venus 2430/udp # Venus callback/wbc interface venus-se 2431/tcp # tcp side effects venus-se 2431/udp # udp sftp side effect codasrv 2432/tcp # not used codasrv 2432/udp # server port codasrv-se 2433/tcp # tcp side effects codasrv-se 2433/udp # udp sftp side effect mon 2583/tcp # MON traps mon 2583/udp dict 2628/tcp # Dictionary server dict 2628/udp f5-globalsite 2792/tcp f5-globalsite 2792/udp gsiftp 2811/tcp gsiftp 2811/udp gpsd 2947/tcp gpsd 2947/udp gds-db 3050/tcp gds_db # InterBase server gds-db 3050/udp gds_db icpv2 3130/tcp icp # Internet Cache Protocol icpv2 3130/udp icp mysql 3306/tcp mysql 3306/udp nut 3493/tcp # Network UPS Tools nut 3493/udp distcc 3632/tcp # distributed compiler distcc 3632/udp daap 3689/tcp # Digital Audio Access Protocol daap 3689/udp svn 3690/tcp subversion # Subversion protocol svn 3690/udp subversion suucp 4031/tcp # UUCP over SSL suucp 4031/udp sysrqd 4094/tcp # sysrq daemon sysrqd 4094/udp sieve 4190/tcp # ManageSieve Protocol epmd 4369/tcp # Erlang Port Mapper Daemon epmd 4369/udp remctl 4373/tcp # Remote Authenticated Command Service remctl 4373/udp f5-iquery 4353/tcp # F5 iQuery f5-iquery 4353/udp iax 4569/tcp # Inter-Asterisk eXchange iax 4569/udp mtn 4691/tcp # monotone Netsync Protocol mtn 4691/udp radmin-port 4899/tcp # RAdmin Port radmin-port 4899/udp rfe 5002/udp # Radio Free Ethernet rfe 5002/tcp mmcc 5050/tcp # multimedia conference control tool (Yahoo IM) mmcc 5050/udp sip 5060/tcp # Session Initiation Protocol sip 5060/udp sip-tls 5061/tcp sip-tls 5061/udp aol 5190/tcp # AIM aol 5190/udp xmpp-client 5222/tcp jabber-client # Jabber Client Connection xmpp-client 5222/udp jabber-client xmpp-server 5269/tcp jabber-server # Jabber Server Connection xmpp-server 5269/udp jabber-server cfengine 5308/tcp cfengine 5308/udp mdns 5353/tcp # Multicast DNS mdns 5353/udp postgresql 5432/tcp postgres # PostgreSQL Database postgresql 5432/udp postgres freeciv 5556/tcp rptp # Freeciv gameplay freeciv 5556/udp amqp 5672/tcp amqp 5672/udp amqp 5672/sctp ggz 5688/tcp # GGZ Gaming Zone ggz 5688/udp x11 6000/tcp x11-0 # X Window System x11 6000/udp x11-0 x11-1 6001/tcp x11-1 6001/udp x11-2 6002/tcp x11-2 6002/udp x11-3 6003/tcp x11-3 6003/udp x11-4 6004/tcp x11-4 6004/udp x11-5 6005/tcp x11-5 6005/udp x11-6 6006/tcp x11-6 6006/udp x11-7 6007/tcp x11-7 6007/udp gnutella-svc 6346/tcp # gnutella gnutella-svc 6346/udp gnutella-rtr 6347/tcp # gnutella gnutella-rtr 6347/udp sge-qmaster 6444/tcp sge_qmaster # Grid Engine Qmaster Service sge-qmaster 6444/udp sge_qmaster sge-execd 6445/tcp sge_execd # Grid Engine Execution Service sge-execd 6445/udp sge_execd mysql-proxy 6446/tcp # MySQL Proxy mysql-proxy 6446/udp afs3-fileserver 7000/tcp bbs # file server itself afs3-fileserver 7000/udp bbs afs3-callback 7001/tcp # callbacks to cache managers afs3-callback 7001/udp afs3-prserver 7002/tcp # users & groups database afs3-prserver 7002/udp afs3-vlserver 7003/tcp # volume location database afs3-vlserver 7003/udp afs3-kaserver 7004/tcp # AFS/Kerberos authentication afs3-kaserver 7004/udp afs3-volser 7005/tcp # volume managment server afs3-volser 7005/udp afs3-errors 7006/tcp # error interpretation service afs3-errors 7006/udp afs3-bos 7007/tcp # basic overseer process afs3-bos 7007/udp afs3-update 7008/tcp # server-to-server updater afs3-update 7008/udp afs3-rmtsys 7009/tcp # remote cache manager service afs3-rmtsys 7009/udp font-service 7100/tcp xfs # X Font Service font-service 7100/udp xfs http-alt 8080/tcp webcache # WWW caching service http-alt 8080/udp bacula-dir 9101/tcp # Bacula Director bacula-dir 9101/udp bacula-fd 9102/tcp # Bacula File Daemon bacula-fd 9102/udp bacula-sd 9103/tcp # Bacula Storage Daemon bacula-sd 9103/udp xmms2 9667/tcp # Cross-platform Music Multiplexing System xmms2 9667/udp nbd 10809/tcp # Linux Network Block Device zabbix-agent 10050/tcp # Zabbix Agent zabbix-agent 10050/udp zabbix-trapper 10051/tcp # Zabbix Trapper zabbix-trapper 10051/udp amanda 10080/tcp # amanda backup services amanda 10080/udp hkp 11371/tcp # OpenPGP HTTP Keyserver hkp 11371/udp bprd 13720/tcp # VERITAS NetBackup bprd 13720/udp bpdbm 13721/tcp # VERITAS NetBackup bpdbm 13721/udp bpjava-msvc 13722/tcp # BP Java MSVC Protocol bpjava-msvc 13722/udp vnetd 13724/tcp # Veritas Network Utility vnetd 13724/udp bpcd 13782/tcp # VERITAS NetBackup bpcd 13782/udp vopied 13783/tcp # VERITAS NetBackup vopied 13783/udp dcap 22125/tcp # dCache Access Protocol gsidcap 22128/tcp # GSI dCache Access Protocol wnn6 22273/tcp # wnn6 wnn6 22273/udp # # Datagram Delivery Protocol services # rtmp 1/ddp # Routing Table Maintenance Protocol nbp 2/ddp # Name Binding Protocol echo 4/ddp # AppleTalk Echo Protocol zip 6/ddp # Zone Information Protocol #========================================================================= # The remaining port numbers are not as allocated by IANA. #========================================================================= # Kerberos (Project Athena/MIT) services # Note that these are for Kerberos v4, and are unofficial. Sites running # v4 should uncomment these and comment out the v5 entries above. # kerberos4 750/udp kerberos-iv kdc # Kerberos (server) kerberos4 750/tcp kerberos-iv kdc kerberos-master 751/udp kerberos_master # Kerberos authentication kerberos-master 751/tcp passwd-server 752/udp passwd_server # Kerberos passwd server krb-prop 754/tcp krb_prop krb5_prop hprop # Kerberos slave propagation krbupdate 760/tcp kreg # Kerberos registration swat 901/tcp # swat kpop 1109/tcp # Pop with Kerberos knetd 2053/tcp # Kerberos de-multiplexor zephyr-srv 2102/udp # Zephyr server zephyr-clt 2103/udp # Zephyr serv-hm connection zephyr-hm 2104/udp # Zephyr hostmanager eklogin 2105/tcp # Kerberos encrypted rlogin # Hmmm. Are we using Kv4 or Kv5 now? Worrying. # The following is probably Kerberos v5 --- [email protected] (11/02/2000) kx 2111/tcp # X over Kerberos iprop 2121/tcp # incremental propagation # # Unofficial but necessary (for NetBSD) services # supfilesrv 871/tcp # SUP server supfiledbg 1127/tcp # SUP debugging # # Services added for the Debian GNU/Linux distribution # linuxconf 98/tcp # LinuxConf poppassd 106/tcp # Eudora poppassd 106/udp ssmtp 465/tcp smtps # SMTP over SSL moira-db 775/tcp moira_db # Moira database moira-update 777/tcp moira_update # Moira update protocol moira-ureg 779/udp moira_ureg # Moira user registration spamd 783/tcp # spamassassin daemon omirr 808/tcp omirrd # online mirror omirr 808/udp omirrd customs 1001/tcp # pmake customs server customs 1001/udp skkserv 1178/tcp # skk jisho server port predict 1210/udp # predict -- satellite tracking rmtcfg 1236/tcp # Gracilis Packeten remote config server wipld 1300/tcp # Wipl network monitor xtel 1313/tcp # french minitel xtelw 1314/tcp # french minitel support 1529/tcp # GNATS cfinger 2003/tcp # GNU Finger frox 2121/tcp # frox: caching ftp proxy ninstall 2150/tcp # ninstall service ninstall 2150/udp zebrasrv 2600/tcp # zebra service zebra 2601/tcp # zebra vty ripd 2602/tcp # ripd vty (zebra) ripngd 2603/tcp # ripngd vty (zebra) ospfd 2604/tcp # ospfd vty (zebra) bgpd 2605/tcp # bgpd vty (zebra) ospf6d 2606/tcp # ospf6d vty (zebra) ospfapi 2607/tcp # OSPF-API isisd 2608/tcp # ISISd vty (zebra) afbackup 2988/tcp # Afbackup system afbackup 2988/udp afmbackup 2989/tcp # Afmbackup system afmbackup 2989/udp xtell 4224/tcp # xtell server fax 4557/tcp # FAX transmission service (old) hylafax 4559/tcp # HylaFAX client-server protocol (new) distmp3 4600/tcp # distmp3host daemon munin 4949/tcp lrrd # Munin enbd-cstatd 5051/tcp # ENBD client statd enbd-sstatd 5052/tcp # ENBD server statd pcrd 5151/tcp # PCR-1000 Daemon noclog 5354/tcp # noclogd with TCP (nocol) noclog 5354/udp # noclogd with UDP (nocol) hostmon 5355/tcp # hostmon uses TCP (nocol) hostmon 5355/udp # hostmon uses UDP (nocol) rplay 5555/udp # RPlay audio service nrpe 5666/tcp # Nagios Remote Plugin Executor nsca 5667/tcp # Nagios Agent - NSCA mrtd 5674/tcp # MRT Routing Daemon bgpsim 5675/tcp # MRT Routing Simulator canna 5680/tcp # cannaserver sane-port 6566/tcp sane saned # SANE network scanner daemon ircd 6667/tcp # Internet Relay Chat zope-ftp 8021/tcp # zope management by ftp tproxy 8081/tcp # Transparent Proxy omniorb 8088/tcp # OmniORB omniorb 8088/udp clc-build-daemon 8990/tcp # Common lisp build daemon xinetd 9098/tcp mandelspawn 9359/udp mandelbrot # network mandelbrot git 9418/tcp # Git Version Control System zope 9673/tcp # zope server webmin 10000/tcp kamanda 10081/tcp # amanda backup services (Kerberos) kamanda 10081/udp amandaidx 10082/tcp # amanda backup services amidxtape 10083/tcp # amanda backup services smsqp 11201/tcp # Alamin SMS gateway smsqp 11201/udp xpilot 15345/tcp # XPilot Contact Port xpilot 15345/udp sgi-cmsd 17001/udp # Cluster membership services daemon sgi-crsd 17002/udp sgi-gcd 17003/udp # SGI Group membership daemon sgi-cad 17004/tcp # Cluster Admin daemon isdnlog 20011/tcp # isdn logging system isdnlog 20011/udp vboxd 20012/tcp # voice box system vboxd 20012/udp binkp 24554/tcp # binkp fidonet protocol asp 27374/tcp # Address Search Protocol asp 27374/udp csync2 30865/tcp # cluster synchronization tool dircproxy 57000/tcp # Detachable IRC Proxy tfido 60177/tcp # fidonet EMSI over telnet fido 60179/tcp # fidonet EMSI over TCP

For an explanation see the Basic TCP/IP networking guide .

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Daytona 500 postponed: Start time, TV, live stream, lineup for NASCAR's season opener

port numbers 500

Editor's note: For the latest updates from Monday's Daytona 500, follow USA TODAY Sports' live coverage here.

Heavy rain at Daytona International Speedway has forced NASCAR's season-opening Daytona 500 on Sunday to be postponed for a day.

NASCAR Cup Series drivers are scheduled take the track for the 66th annual Daytona 500 on Monday afternoon as they look to etch their name in history and lift the Harley J. Earl Trophy in victory lane.

It will be an all Ford front row with two former Daytona 500 winners pacing the field. Joey Logano, the 2015 winner, won the pole Wednesday night. The two-time Cup Series champion will start alongside 2021 Daytona 500 winner Michael McDowell.

Thursday night's Daytona Duel winners will start on Row 2. Tyler Reddick starts third to lead the Toyota contingent, followed by fellow Toyota driver Christopher Bell. Chase Elliott , the 2020 Cup Series champion, starts fifth, the best of the Chevrolet drivers.

Here is all the information you need to get ready for the 2024 Daytona 500, the season-opener of the NASCAR Cup Series:

What time does the 2024 Daytona 500 start?

Saturday's Xfinity Series opener  was also rained out . It's been  rescheduled for Monday at 11 a.m.  The 2024 Daytona 500 is now scheduled to start on Monday after the conclusion of the Xfinity series race, sometime around 4 p.m. ET at Daytona International Speedway.

What TV channel is the 2024 Daytona 500 on?

The Daytona 500 will be broadcast on Fox.

Will there be a live stream of the 2024 Daytona 500?

The Daytona 500 can be live streamed on the  FoxSports website  and on the FoxSports app. 

What is the weather forecast for the Daytona 500?

After rain is expected to leave the Daytona area early Sunday evening, the forecast calls for clearing skies on Monday with temperatures in the high 50s to low 60s throughout the day.

How many laps is the 2024 Daytona 500?

The race is 200 laps around the 2.5-mile Daytona International Speedway for a total of 500 miles.

The race will feature three segments (laps per stage) — Stage 1: 65 laps; Stage 2: 65 laps; Stage 3: 70 laps.

Who won the Daytona 500 last year?

Ricky Stenhouse Jr. edged 2022 NASCAR Cup Series champion Joey Logano in double overtime to win the 2023 Daytona 500 , notching his third career Cup victory and first since he won the Daytona summer race in 2017.

What is the lineup for the 2024 Daytona 500?

Here is the lineup, with car number in parentheses and manufacturer:

1. (22) Joey Logano, Ford

2. (34) Michael McDowell, Ford

3. (45) Tyler Reddick, Toyota

4. (20) Christopher Bell, Toyota

5. (9) Chase Elliott, Chevrolet

6. (2) Austin Cindric, Ford

7. (48) Alex Bowman, Chevrolet

8. (11) Denny Hamlin, Toyota

9. (77) Carson Hocevar, Chevrolet

10. (42) John Hunter Nemechek, Toyota

11. (43) Erik Jones, Toyota

12. (21) Harrison Burton, Ford

13. (99) Daniel Suarez, Chevrolet

14. (71) Zane Smith, Chevrolet

15. (54) Ty Gibbs, Toyota

16. (6) Brad Keselowski, Ford

17. (5) Kyle Larson, Chevrolet

18. (24) William Byron, Chevrolet

19. (17) Chris Buescher, Ford

20. (14) Chase Briscoe, Ford

21. (1) Ross Chastain, Chevrolet

22. (51) Justin Haley, Ford

23. (84) Jimmie Johnson, Toyota

24. (23) Bubba Wallace, Toyota

25. (41) Ryan Preece, Ford

26. (36) Kaz Grala, Ford

27. (19) Martin Truex Jr., Toyota

28. (16) AJ Allmendinger, Chevrolet

29. (7) Corey LaJoie, Chevrolet

30. (4) Josh Berry, Ford

31. (38) Todd Gilliland, Ford

32. (12) Ryan Blaney, Ford

33. (3) Austin Dillon, Chevrolet

34. (8) Kyle Busch, Chevrolet

35. (47) Ricky Stenhouse Jr., Chevrolet

36. (15) Riley Herbst, Ford

37. (31) Daniel Hemric, Chevrolet

38. (10) Noah Gragson, Ford

39. (62) Anthony Alfredo, Chevrolet

40. (60) David Ragan, Ford

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50 Common Ports You Should Know

Port number is a 16-bit numerical value that ranges from 0 to 65535. Well-known port (0-1023), registered port (1024-49151), and dynamic port is three types of port number space. (49152-65535).

These ports can be opened and used by software applications and operating system services to send and receive data over networks (LAN or WAN) that employ certain protocols (eg TCP, UDP).

For example, we use 80 for HTTP-web-based plain-text surfing and 443 for HTTPS-web-based encrypted websites in our daily work.

To conclude, a port is a logical form to identify system activities or various network services used to create local or network-based communications.

What are the functions of ports?

When interacting over the Internet, TCP and UDP protocols make connections, recompile data packages after the transfer, and then deliver them to applications on the recipient’s device. For this handover to work, the operating system must install and open the gateway for the transfer. Each door has a unique code number. After transmission, the receiving system uses the port number to determine where the data should be sent. The port numbers of the sender and receiver are always included in the data packet.

Ports are assigned sequential numbers from 0 to 65535. Some of these codes are standardized, meaning they are assigned to certain uses. Since code numbers are universally recognized and permanently assigned, these standard ports are also known as well-known ports. Registered ports are those that organizations or software developers have registered for their applications. Registration is handled by the Internet Assigned Numbers Authority (IANA). A diverse selection of dynamically assigned port numbers is also available. For example, when viewing websites, browsers use these ports. After that, the phone number is free again.

Why is it important to know these ports?

Any security researcher, bug bounty hunter, or anyone working with service configuration would benefit from this. Knowing how to do more thorough scans such as version detection or known vulnerabilities for ancient services that are still operating in the infrastructure, especially when using tools like Nmap, is handy when getting to know these protocols and services. 

The most 50 significant ports are listed here:

The following are some of the most common service names, transport protocol names, and port numbers used to differentiate between specific services that employ TCP, UDP, DCCP, and SCTP.

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40 Network Protocols with Port Numbers, Transport Protocols and Meanings 

port numbers 500

40 Network Protocol Names And Port Numbers With Their Transport Protocols And Meanings tabulated by Precious Ocansey (HND, Network Engineer).

Before going straight to the table.

Firstly, what are Network Protocols?

Network protocols are the languages and rules used during communication in a computer network. There are two major transport protocols namely;

TCP and UDP

port numbers 500

TCP   which stands for “Transmission Control Protocol”, is a suite of communication protocols used to interconnect network devices on a local network or a public network like the internet. TCP  is known as “connection-oriented” protocols as it ensures each data packet is delivered as requested. Therefore, TCP is used for transferring most types of data such as webpages and files over the Internet.

UDP which stands for “User Datagram Protocol” is part of the TCP/IP suite of protocols used for data transferring. UDP is a known as a “connectionless-oriented” protocol, meaning it doesn’t acknowledge that the packets being sent have been received. For this reason, the UDP protocol is typically used for streaming media. While you might see skips in video or hear some fuzz in audio clips, UDP transmission prevents the playback from stopping completely.

Furthermore, TCP also includes built-in error checking means TCP has more overhead and is therefore slower than UDP, it ensures accurate delivery of data between systems. Therefore TCP is used for transferring most types of data such as webpages and files over the local network or Internet. UDP is ideal for media streaming which does not require all packets to be delivered.

Port Numbers: They are the unique identifiers given to all protocol numbers so they can be accessed easily.

Below is as written  by Precious Ocansey. The 40 Network Protocols, their port numbers and their transport protocols

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port numbers 500

Good job.interesting more grace sir

Iṣẹ rere, diẹ ẹ sii oore ọfẹ

port numbers 500

ICMP does not use any port, 1 is its protocol number.

port numbers 500

Updated. Thank you

port numbers 500

IGMP does not use a transport layer protocol such as TCP or UD

port numbers 500

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TCP/UDP Ports Cheatsheet

This site is a reference for Well-known TCP/UDP Ports

In computer networking, ports are communication endpoints identified by a 16-bit port number (0-65353). Ports are logical constructs which at the software level identifies a specific process or network service. The two most common transport protocols using ports are TCP and UDP.

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Short-lived and reserved port numbers for TCP/UDP

Ports List Source.

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2024 Daytona 500: Date, time, schedule, lineup, weather, qualifying, drivers, location, rumors, complete guide

The 66th running of 'the great american race' will take place monday afternoon due to rain sunday.

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DAYTONA BEACH, Fla. -- Just a short way away from the beach that became one of the major showcases of the power of the automobile, the Daytona International Speedway has served as one of the world's greatest and unmistakably American cathedrals of speed. And no race it holds all year is more unmistakably its own than the one that bears its very name.

After rain all day Sunday forced the race to be postponed , Monday afternoon marks the 66th running of the Daytona 500, the biggest prize in all of stock car racing and the season-opening race for the NASCAR Cup Series. The rainout Sunday marks the third time in race history it has been postponed to Monday, all of which have come since 2012. Matt Kenseth won the first-ever Daytona 500 run on a Monday evening in 2012, while Denny Hamlin took the checkered flag four years ago in the rain-delayed 2020 race.

The event has plenty of celebrity crossover appeal. Dwayne "The Rock" Johnson is this year's Grand Marshal while DJ Khaled is the honorary starter. The Rock will deliver those four most important words in motorsports: "Drivers, start your engines" to signal it's officially time to go racing. 

It's a busy weekend as the season kicks off with arguably the biggest race of the season. Be sure to stay up to date with all the happenings around Daytona Beach with our coverage of the race -- including the updated start time -- which you can catch up on below. Bookmark this page as it will be updated with the latest race info and news through the checkered flag on Sunday.

Daytona 500 pace laps

  • Overall race preview, expert picks

Daytona 500 postponed to Monday due to rain

  • Joey Logano earns first Daytona 500 pole, breaking Hendrick's streak
  • Christopher Bell, Tyler Reddick win qualifying races; Jimmie Johnson makes field
  • Defending champ Ricky Stenhouse Jr. returning to track that keeps revitalizing his career
  • How CBS Sports' telecasts of "The Great American Race" transformed NASCAR on television
  • What Kyle Larson, other stars had to say at media day for "The Great American Race"

Daytona 500 info

Date: Monday, Feb. 19 Location: Daytona International Speedway -- Daytona Beach, Florida Time: 4 p.m. ET TV:  FoxStream: fubo ( try for free )

Daytona 500 starting lineup

  • #22 - Joey Logano
  • #34 - Michael McDowell
  • #45 - Tyler Reddick
  • #20 - Christopher Bell
  • #9 - Chase Elliott
  • #2 - Austin Cindric
  • #48 - Alex Bowman
  • #11 - Denny Hamlin
  • #77 - Carson Hocevar (R)
  • #42 - John Hunter Nemechek
  • #43 - Erik Jones
  • #21 - Harrison Burton
  • #99 - Daniel Suarez
  • #71 - Zane Smith (R)
  • #54 - Ty Gibbs
  • #6 - Brad Keselowski
  • #5 - Kyle Larson
  • #24 - William Byron
  • #17 - Chris Buescher
  • #14 - Chase Briscoe
  • #1 - Ross Chastain
  • #51 - Justin Haley
  • #84 - Jimmie Johnson
  • #23 - Bubba Wallace
  • #41 - Ryan Preece
  • #36 - Kaz Grala
  • #19 - Martin Truex Jr.
  • #16 - A.J. Allmendinger
  • #7 - Corey LaJoie
  • #4 - Josh Berry (R)
  • #38 - Todd Gilliland
  • #12 - Ryan Blaney
  • #3 - Austin Dillon
  • #8 - Kyle Busch
  • #47 - Ricky Stenhouse Jr.
  • #15 - RIley Herbst
  • #31 - Daniel Hemric
  • #10 - Noah Gragson
  • #62 - Anthony Alfredo
  • #60 - David Ragan

Failed to qualify: B.J. McLeod, J.J. Yeley

So who wins the 2024 Daytona 500? And which longshot has the potential to stun NASCAR?  Visit SportsLine now to see the 2024 NASCAR at Daytona picks and best bets  from a NASCAR insider who called Chastain and Suarez's breakthrough wins in 2022, and find out.

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When is the 2024 Daytona 500? New time, TV info for NASCAR Cup Series race

NASCAR fans will have to wait one more day for the first race of the 2024 NASCAR Cup Series .

Inclement weather forced the motorsports organization to postpone the Daytona 500 after it was originally scheduled for Sunday. NASCAR initially pushed the race back a few hours before eventually moving it to Monday.

Joey Logano , the Team Penske driver who won the Daytona 500 in 2015, won pole position on Wednesday. He will start in the front row of the grid alongside Front Row Motorsports driver Michael McDowell, who won in Daytona in 2021.

From NFL plays to college sports scores, all the top sports news you need to know every day.

Here's what to know about the 2024 race after its postponement.

NASCAR commentary: Kevin Harvick becomes full-time TV analyst, reveals he wants to be 'John Madden of NASCAR'

When is the 2024 Daytona 500?

Following Sunday's announcement the Daytona 500 would be postponed, here's the new start time for the 2024 Daytona 500.

Date: Monday, Feb. 19, 2024

Time: 4 p.m. ET.

Location: Daytona International Speedway, Daytona Beach, Florida

How to watch the 2024 Daytona 500

Cable TV: FOX

Streaming: Fox Sports app; Sling; YouTube TV; fuboTV

How to watch: Catch the full Daytona 500 with a Fubo subscription

Daytona 500 2024 lineup

This is the full lineup for this year's Daytona 500, including car numbers and manufacturer for each driver.

  • (Car No. 22) Joey Logano, Ford
  • (34) Michael McDowell, Ford
  • (45) Tyler Reddick, Toyota
  • (20) Christopher Bell, Toyota
  • (9) Chase Elliott, Chevrolet
  • (2) Austin Cindric, Ford
  • (48) Alex Bowman, Chevrolet
  • (11) Denny Hamlin, Toyota
  • (77) Carson Hocevar, Chevrolet
  • (42) John Hunter Nemechek, Toyota
  • (43) Erik Jones, Toyota
  • (21) Harrison Burton, Ford
  • (99) Daniel Suarez, Chevrolet
  • (71) Zane Smith, Chevrolet
  • (54) Ty Gibbs, Toyota
  • (6) Brad Keselowski, Ford
  • (5) Kyle Larson, Chevrolet
  • (24) William Byron, Chevrolet
  • (17) Chris Buescher, Ford
  • (14) Chase Briscoe, Ford
  • (1) Ross Chastain, Chevrolet
  • (51) Justin Haley, Ford
  • (84) Jimmie Johnson, Toyota
  • (23) Bubba Wallace, Toyota
  • (41) Ryan Preece, Ford
  • (36) Kaz Grala, Ford
  • (19) Martin Truex Jr., Toyota
  • (16) AJ Allmendinger, Chevrolet
  • (7) Corey LaJoie, Chevrolet
  • (4) Josh Berry, Ford
  • (38) Todd Gilliland, Ford
  • (12) Ryan Blaney, Ford
  • (3) Austin Dillon, Chevrolet
  • (8) Kyle Busch, Chevrolet
  • (47) Ricky Stenhouse Jr., Chevrolet
  • (15) Riley Herbst, Ford
  • (31) Daniel Hemric, Chevrolet
  • (10) Noah Gragson, Ford
  • (62) Anthony Alfredo, Chevrolet
  • (60) David Ragan, Ford

We occasionally recommend interesting products and services. If you make a purchase by clicking one of the links, we may earn an affiliate fee. USA TODAY Network newsrooms operate independently, and this doesn’t influence our coverage.

This article originally appeared on USA TODAY: When is the 2024 Daytona 500? New time, TV info for NASCAR Cup Series race

Ricky Stenhouse Jr., center, celebrates after winning the 2023 Daytona 500 at Daytona International Speedway.

The Daytona 500 starts today. Here's what to know about its delay and where to watch

Overall view of empty grandstands at the start finish line in the tri-oval as it rains Sunday, February 18, 2024, following the postponement of the Daytona 500 to Monday due to rain at Daytona International Speedway in Daytona Beach, Florida.

A stormy Sunday forced the Daytona 500 , the first race of the 2024 NASCAR Cup series, to postpone its start until today. Here's what we know about its new start time.

What time is the Daytona 500?

The race will run at approximately 4 p.m. ET Monday at Daytona International Speedway in Daytona Beach, Florida. The Great American Race will start after the conclusion of NASCAR's Xfinity series race, which is scheduled to begin at 11 a.m. ET.

On what channel is the Daytona 500 being broadcast?

The Daytona 500 is being televised by Fox. Race fans can live stream the race on the  Fox Sports website  and on the Fox Sports app. 

Why was the Daytona 500 postponed?

Inclement weather forced NASCAR to postpone the  Daytona 500  after it was originally scheduled for Sunday. The motorsports organization initially pushed the race back a few hours before eventually moving it to Monday.

Previously, inclement weather pushed the 2012 race to Monday. The 2020 Daytona 500 also started on a Monday.

More: 2024 Daytona 500: Daytona 500 FAQ as NASCAR hopes to open its Cup Series season with an American classic

Who won the pole position for the Daytona 500?

Joey Logano , the Team Penske driver who won the Daytona 500 in 2015, won pole position on Wednesday. He will start in the front row of the grid alongside Front Row Motorsports driver Michael McDowell, who won in Daytona in 2021.

Daytona 500 2024 lineup

This is the full lineup for this year's Daytona 500, including car numbers and manufacturer for each driver.

  • (Car No. 22) Joey Logano, Ford
  • (34) Michael McDowell, Ford
  • (45) Tyler Reddick, Toyota
  • (20) Christopher Bell, Toyota
  • (9) Chase Elliott, Chevrolet
  • (2) Austin Cindric, Ford
  • (48) Alex Bowman, Chevrolet
  • (11) Denny Hamlin, Toyota
  • (77) Carson Hocevar, Chevrolet
  • (42) John Hunter Nemechek, Toyota
  • (43) Erik Jones, Toyota
  • (21) Harrison Burton, Ford
  • (99) Daniel Suarez, Chevrolet
  • (71) Zane Smith, Chevrolet
  • (54) Ty Gibbs, Toyota
  • (6) Brad Keselowski, Ford
  • (5) Kyle Larson, Chevrolet
  • (24) William Byron, Chevrolet
  • (17) Chris Buescher, Ford
  • (14) Chase Briscoe, Ford
  • (1) Ross Chastain, Chevrolet
  • (51) Justin Haley, Ford
  • (84) Jimmie Johnson, Toyota
  • (23) Bubba Wallace, Toyota
  • (41) Ryan Preece, Ford
  • (36) Kaz Grala, Ford
  • (19) Martin Truex Jr., Toyota
  • (16) AJ Allmendinger, Chevrolet
  • (7) Corey LaJoie, Chevrolet
  • (4) Josh Berry, Ford
  • (38) Todd Gilliland, Ford
  • (12) Ryan Blaney, Ford
  • (3) Austin Dillon, Chevrolet
  • (8) Kyle Busch, Chevrolet
  • (47) Ricky Stenhouse Jr., Chevrolet
  • (15) Riley Herbst, Ford
  • (31) Daniel Hemric, Chevrolet
  • (10) Noah Gragson, Ford
  • (62) Anthony Alfredo, Chevrolet
  • (60) David Ragan, Ford

Did anybody win the Powerball on Wednesday? What to know about the $376 million jackpot

Powerball tickets. [Kyle Robertson/Dispatch file photo]

With no grand prize winner from Wednesday‘s Powerball drawing, the jackpot now is worth an estimated $376 million with a cash value of $177.5 million.

Here's what else to know about Saturday's Powerball drawing.

Winning Powerball numbers for Feb. 21, 2024

The winning numbers for Wednesday night's drawing were 4, 27, 33, 41, 42 and the Powerball was 14. The Power Play was 2X. No one claimed the entire prize, but there was one lucky winner.

Did anyone win the Powerball jackpot Wednesday night?

No one won the jackpot, but someone in Arkansas won the $1 million prize.

What is the largest Powerball jackpot?

The $376 million jackpot could make a lucky winner very happy, but it's not even close to being the top Powerball jackpot of all time.

  • $2.04 billion – Nov. 7, 2022 – California
  • $1.5 billion – Jan. 13, 2016 – California, Florida and Tennessee
  • $1.4 billion (est.) – Oct. 7, 2023
  • $1.08 billion – July 19, 2023 – California
  • $768.4 million – March 27, 2019 – Wisconsin
  • $758.7 million – Aug. 23, 2017 – Massachusetts
  • $754.6 million – Feb. 6, 2023 - Washington
  • $731.1 million – Jan. 20, 2021 – Maryland
  • $699.8 million – Oct. 4, 2021 – California
  • $687.8 million – Oct. 27, 2018 – Iowa, New York

When is the next Powerball drawing?

The next drawing will be at 10:59 p.m. ET on Saturday night. Drawings are held at 10:59 p.m. ET every Monday, Wednesday and Saturday.

Where to buy Powerball tickets

If you're feeling lucky, you can purchase tickets for the Powerball drawing at the 9,800 or so convenience stores or Ohio Lottery retailers throughout the state. Visit the Ohio Lottery website to find a retailer.

What is the largest Powerball jackpot ever won?

The largest Powerball jackpot ever won was $2.04 billion in November, 2022, while the top 9 Powerball jackpots have all been won since 2016.

How do you play the Powerball?

To play, select five numbers from one to 69 for the white balls, then select one number from one to 26 for the red Powerball. You can choose your lucky numbers on a play slip or let the lottery terminal randomly pick your numbers.

How can you win Powerball? There are nine ways

  • Five white balls + one red Powerball = Jackpot
  • Five white balls = $1 million
  • Four white balls + one red Powerball = $50,000
  • Four white balls = $100
  • Three white balls + one red Powerball = $100
  • Three white balls = $7
  • Two white balls + one red Powerball = $7
  • One white ball + one red Powerball = $4
  • One red Powerball = $4

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IMAGES

  1. IP Well Known Port Numbers/ Common TCP

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  2. TCP/IP common Port's cheet sheet

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  3. Common & Popular Ports Number used in OS

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  4. what are port numbers in networking

    port numbers 500

  5. List of Common Network Port Numbers

    port numbers 500

  6. Master the Art of Port Numbers with this Cheat Sheet

    port numbers 500

VIDEO

  1. 401 to 500 Numbers in Words in English

  2. Port work an numbers on ms460 build

  3. 70- Port Number (Application Address) 2

  4. Numbers 500 to 0

  5. Port numbers for Echo 4910 higher RPM

  6. Chalenge Numbers 500

COMMENTS

  1. List of TCP and UDP port numbers

    The port numbers in the range from 0 to 1023 (0 to 2 10 − 1) are the well-known ports or system ports. They are used by system processes that provide widely used types of network services. On Unix-like operating systems, a process must execute with superuser privileges to be able to bind a network socket to an IP address using one of the well-known ports.

  2. Port 500 (tcp/udp) :: SpeedGuide

    SANS Internet Storm Center: port 500 Notes: Port numbers in computer networking represent communication endpoints. Ports are unsigned 16-bit integers (0-65535) that identify a specific process, or network service.

  3. Service overview and network port requirements for Windows

    The table is sorted by the port number instead of by the service name. Use this section to quickly determine which services listen on a particular port. ... (UDP port 500) Finally, you can hard-code the port that is used for Active Directory replication by following the steps in Restricting Active Directory RPC traffic to a specific port.

  4. List of TCP Ports and UDP Ports (Well-Known)

    Updated on May 1, 2020 The Transmission Control Protocol (TCP) and User Datagram Protocol (UDP) each use port numbers for their communication channels. The ports numbered 0 through 1023 are the well-known system ports, reserved for special uses. Port 0 is not used for TCP/UDP communication although it used as a network programming construct.

  5. Well-Known TCP/IP Port Numbers, Service Names & Protocols

    Articles TCP/IP Well Known Port Numbers (0 to 1023) What are the TCP/IP Well Known Port Numbers (0 to 1023) About TCP/UDP Ports Port 0 to 1023: These TCP/UDP port numbers are considered as well-known ports. These ports are assigned to specific server sevice by the Internet Assigned Numbers Authority (IANA).

  6. What is a computer port?

    There are 65,535 possible port numbers, although not all are in common use. Some of the most commonly used ports, along with their associated networking protocol, are: ... traffic goes to port 443. Network services that use HTTPS for encryption, such as DNS over HTTPS, also connect at this port. Port 500: Internet Security Association and Key ...

  7. PDF COMMON PORTS packetlife.net TCP/UDP Port Numbers

    411-412 Direct Connect 443 HTTP over SSL 445 Microsoft DS 464 Kerberos 465 SMTP over SSL 497 Retrospect 500

  8. Security+ Ports

    Well known port numbers are matched to specific protocols and when you see the port, you should be able to identify the protocol. Sometimes you may be given the protocol and be required to identify the port. ... 500: L2TP - Layer 2 Tunneling Protocol: UDP: 1701: PPTP - Point-to-Point Tunneling Protocol: TCP: UDP: 1723: RDP - Remote ...

  9. Port 500

    Port 500 is used for Internet Security Association and Key Management Protocol (ISAKMP) or Internet Key Exchange (IKE) traffic. It is mainly used for setting up a secure communication channel between two devices in a Virtual Private Network (VPN). Ports those registered with IANA are shown as official ports.

  10. TCP/UDP Port Number List

    The port numbers are divided into three ranges: the Well Known Ports, the Registered Ports, and the Dynamic and/or Private Ports. ... /udp ISO ILL Protocol # Mark H. Needleman isakmp 500/tcp isakmp isakmp 500/udp isakmp # Mark Schertler stmf 501/tcp STMF stmf 501/udp STMF # Alan Ungar asa-appl-proto 502/tcp asa-appl-proto asa-appl-proto 502 ...

  11. Common Ports Cheat Sheet: The Ultimate List

    Registered Ports: 1024 - 49151 Dynamic/Private Ports: 49152 - 65535 You may use these ports for custom applications free from concerns that it may clash with existing processes. The Most Common Ports for Exams If you're studying for IT certifications such as CCNA, focus on these ports: Conclusion We hope that you found this cheat sheet useful.

  12. Common Ports Cheat Sheet

    TCP (Transmission Control Protocol) UDP (User Datagram Protocol) - Only one port needed for bidirectional traffic SCTP (Stream Control Transmission Protocol) DCCP (Datagram Congestion Control Protocol) Common Well-known/System Ports in Computer Networking Well-known network ports range from 0 to 1023.

  13. TCP and UDP port numbers

    There are different types of port numbers: Well Known Ports (Numbers 0 to 1023), Registered Ports (Numbers 1024 to 49151) and Dynamic or Private Ports (Numbers 49152 to 65535). The last porn number type Dynamic or Private Ports will not appear on our list because they are cannot be registered with IANA.

  14. PDF List of TCP and UDP port numbers

    Originally, port numbers were used by the Network Control Program (NCP) in the ARPANET for which two ports were required for half-duplex transmission. Later, the Transmission Control Protocol (TCP) ... 500 TCP UDP Internet Security Association and Key Management Protocol (ISAKMP) / Internet Key Exchange (IKE)[11] Official 502 TCP UDP Modbus ...

  15. List of TCP and UDP port numbers

    Summarize this article for a 10 year old SHOW ALL QUESTIONS This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic.

  16. TCP ports / UDP ports: What ports are important and why?

    Every entrance has a specific code number. After the transfer, the receiving system knows where the data has to be delivered based on the port number. The data package always includes two port numbers: the sender's and the recipient's. ... 500 : : isakmp : Security protocol : 512 : : exec : Remote process execution : 512 : :

  17. TCP/UDP port numbers (/etc/services)

    The combination of IP address, port and protocol is called a socket, and has to be unique for every service. The port numbers area available for both TCP and UDP, and when referred to in conjunction with the IP address it specifies the "socket". ... Internet Security Association isakmp 500/udp # and Key Management Protocol rtsp 554/tcp # Real ...

  18. PDF TCP and UDP Port Configuration

    To determine if Ports are open or locked down you can run the Port Probe utility attached to the following. AID 39459 - TCP Port Probe Utilty. For TCP/UDP ports used by GuardPLC products, see AID 59004 - TCP/UDP ports used by GuardPLC products. For information on how to manually open TCP/UDP ports, refer to AID 59857 - How to manually open TCP ...

  19. What are port numbers and how do they work?

    Lynn Haber, Senior Writer What is a port number? A port number is a way to identify a specific process to which an internet or other network message is to be forwarded when it arrives at a server. All network-connected devices come equipped with standardized ports that have an assigned number.

  20. Daytona 500 postponed: New start time, TV, live stream, 2024 lineup

    What is the lineup for the 2024 Daytona 500? Here is the lineup, with car number in parentheses and manufacturer: 1. (22) Joey Logano, Ford. 2. (34) Michael McDowell, Ford. 3. (45) Tyler Reddick ...

  21. 50 Common Ports You Should Know

    50 Common Ports You Should Know. Port number is a 16-bit numerical value that ranges from 0 to 65535. Well-known port (0-1023), registered port (1024-49151), and dynamic port is three types of port number space. (49152-65535). These ports can be opened and used by software applications and operating system services to send and receive data over ...

  22. TCP/IP Ports and Protocols

    One of the many fundamental things to know as a network engineer is the function and port number used by a number of common services as well as many that are typically implemented during the course of a network engineer's career. This article takes a look at these protocols, provides a basic description of their function and lists the port numbers that they are commonly associated with.

  23. 40 Network Protocols with Port Numbers, Transport Protocols and Meanings

    The 40 Network Protocols, their port numbers and their transport protocols. 1. File Transfer Protocol (FTP) It is a protocol that carries data guarantees that data will be delivered properly. 2. Secure Shell (SSH) It is a cryptographic network protocol used to secure data communication. 3.

  24. TCP/UDP Ports Cheatsheet

    TCP/UDP Ports Cheatsheet. In computer networking, ports are communication endpoints identified by a 16-bit port number (0-65353). Ports are logical constructs which at the software level identifies a specific process or network service. The two most common transport protocols using ports are TCP and UDP.

  25. 2024 Daytona 500: Date, time, schedule, lineup, weather, qualifying

    Daytona 500 info. Date: Monday, Feb. 19 Location: Daytona International Speedway -- Daytona Beach, Florida Time: 4 p.m. ET TV: FoxStream: fubo (try for free) Daytona 500 starting lineup #22 - Joey ...

  26. Daytona 500 postponed until Monday due to persistent rain

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  27. When is the 2024 Daytona 500? New time, TV info for NASCAR Cup ...

    How to watch: Catch the full Daytona 500 with a Fubo subscription. Daytona 500 2024 lineup. This is the full lineup for this year's Daytona 500, including car numbers and manufacturer for each driver.

  28. What time is the Daytona 500? What to know about the NASCAR race

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  29. Powerball jackpot at $376 million before Saturday drawing

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