Port is reserved by IANA, generally to prevent collision having its previous use removed. Table legend Legend of TCP and UDP protocol table cells for port numbersĭescribed protocol is assigned by IANA for this port, and is: standardized, specified, or widely used for such.ĭescribed protocol is not assigned by IANA for this port, but is: standardized, specified, or widely used for such.ĭescribed protocol is assigned by IANA for this port, but is not: standardized, specified, or widely used for such.ĭescribed protocol is not: assigned by IANA for this port, standardized, specified, or widely used for such. 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 (IANA) 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 Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic.

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