List of TCP and UDP port numbers

<p>This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The <a href="/facts/Transmission_Control_Protocol/WW4sPrt9">Transmission Control Protocol</a> (TCP) and the <a href="/facts/User_Datagram_Protocol/dxLU0D6q">User Datagram Protocol</a> (UDP) only need one <a href="/facts/Port_(computer_networking)/ygoHVKNC">port</a> for <a href="/facts/Duplex_(telecommunications)/LCULeVxr">bidirectional</a> traffic. TCP usually uses port numbers that match the services of the corresponding UDP implementations, if they exist, and vice versa.
</p><p>The <a href="/facts/Internet_Assigned_Numbers_Authority/b6MlP6zQ">Internet Assigned Numbers Authority</a> (IANA) is responsible for maintaining the official assignments of port numbers for specific uses, 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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List of TCP and UDP port numbers open-in-new

List of TCP and UDP port numbers