Telnet protocol-unencrypted text communications Secure Shell, secure logins, file transfers and port forwarding Remote Job Entry was historically using socket 5 in its old socket form, while MIB PIM has identified it as TCP/5 and IANA has assigned both TCP and UDP 5 to it. Both TCP and UDP have been assigned to TCPMUX by IANA, but by design only TCP is specified. In programming APIs, requests a system-allocated port 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. They are used by system processes that provide widely used types of network services. Well-known portsThe port numbers in the range from 0 to 1023 are the well-known ports or system ports. Protocol use by port number is unknown or unverified. Protocol is reserved by IANA for future use or special purposes. For unassigned ports, the port number may be available for assignment upon requesting assignment by IANA. Not applicable or currently unassigned port number. Port number doesn't use the protocol, but may use the protocol on another specified port. Port number may use the protocol conditionally only, or alternate its use. Port number is assigned by IANA for protocol use, but may not be standardized, specified or widely used for such. Table legend Cellĭescribed protocol is standardized, specified or widely used for the port number.ĭescribed protocol is not standardized, specified or widely used for the port number. This article lists port numbers and their associated protocols that have experienced significant uptake. Similarly many of the official assignments refer to protocols that were never or are no longer in common use. However, many unofficial uses of both well-known and registered port numbers occur in practice. The Internet Assigned Numbers Authority is responsible for maintaining the official assignments of port numbers for specific uses. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist. The Stream Control Transmission Protocol and the Datagram Congestion Control Protocol also use port numbers. The Transmission Control Protocol and the User Datagram Protocol needed only one port for full-duplex, bidirectional traffic. This is a list of TCP and UDP port numbers used by protocols of the Internet protocol suite for operation of network applications.
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