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List of TCP and UDP port numbers

List of TCP and UDP port numbers
This is a list of Internet socket port numbers used by protocols of the transport layer of the Internet Protocol Suite for the establishment of host-to-host connectivity. 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) and the User Datagram Protocol (UDP) needed only one port for full-duplex, bidirectional traffic. The even-numbered ports were not used, and this resulted in some even numbers in the well-known port number range being unassigned. The Stream Control Transmission Protocol (SCTP) and the Datagram Congestion Control Protocol (DCCP) also use port numbers. They usually use port numbers that match the services of the corresponding TCP or UDP implementation, if they exist. Table legend[edit] Official: Port is registered with IANA for the application.[1] Unofficial: Port is not registered with IANA for the application. See also[edit]

https://en.wikipedia.org/wiki/List_of_TCP_and_UDP_port_numbers

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