This is a list of software port numbers used by the protocols of the transport layer of the following Internet protocols for the installation of host-to-host connection. Traditionally software ports are used by TCP (Transmission Control Protocol) and UDP (User DataGram Protocol) protocols. These protocols need a single port for Full-Duplex traffic. SCTP (Stream Control Protocol) and DCCP (Datagram Congestion Control Protocol) protocols, appeared later use these same port numbers by typically choosing, and when they exist, the port numbers that match the same TCP or UDP services. . The Assigned Numbers Authority (IANA) Internet is the organization officially responsible for maintaining port numbers assignments for specific uses. However, in the practice of many protocols use the wearing numbers that are well known and recorded. In the same way, many official ports affected refer to protocols that have never existed or are no longer common use. This article lists the port numbers and the...