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List of TCP and UDP port numbers
From Wikipedia, the free encyclopedia Jump to: navigation, searchThis 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 communications.
Originally, these port numbers were used by the Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP), but are used also for the Stream Control Transmission Protocol (SCTP), and the Datagram Congestion Control Protocol (DCCP). SCTP and DCCP services usually use a port number that matches the service of the corresponding TCP or UDP implementation if they exist. The Internet Assigned Numbers Authority (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.
Contents
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Table legend
| Use | Description | Color |
|---|---|---|
| Official | Port is registered with IANA for the application | white |
| Unofficial | Port is not registered with IANA for the application | blue |
| Multiple use | Multiple applications are known to use this port. | yellow |
Well-known ports
The port numbers in the range from 0 to 1023 are the well-known ports. They are used by system processes that provide widely-used types of network services. 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.
| Port | TCP | UDP | Description | Status |
|---|---|---|---|---|
| 0 | UDP | Reserved | Official | |
| 1 | TCP | UDP | TCP Port Service Multiplexer (TCPMUX) | Official |
| 2 | TCP | UDP | CompressNET Management Utility | Official |
| 3 | TCP | UDP | CompressNET Compression Process | Official |
| 4 | TCP | UDP | Unassigned | Official | <
