# Registered port

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Port ranges Start End Designation 0 1023 System or well-known ports 1024 49151 User or registered ports 49152 65535 Dynamic, private or ephemeral ports

A **registered port** is a [network port](/source/Network_port) designated for use with a certain protocol or application.

Registered port numbers are currently assigned by the [Internet Assigned Numbers Authority](/source/Internet_Assigned_Numbers_Authority) (IANA) and were assigned by [Internet Corporation for Assigned Names and Numbers](/source/Internet_Corporation_for_Assigned_Names_and_Numbers) (ICANN) before March 21, 2001,[1] and were assigned by the [Information Sciences Institute](/source/Information_Sciences_Institute) (USC/ISI) before 1998.

Ports with numbers 0–1023 are called *system* or *[well-known ports](/source/Well-known_port)*; ports with numbers 1024-49151 are called *user* or *[registered ports](/source/Well-known_port#Registered_ports)*, and ports with numbers 49152-65535 are called *dynamic*, *private* or *[ephemeral ports](/source/Ephemeral_port)*.[2] Both system and user ports are used by transport protocols ([TCP](/source/Transmission_Control_Protocol), [UDP](/source/User_Datagram_Protocol), [DCCP](/source/DCCP), [SCTP](/source/SCTP)) to identify an application or service.

## See also

- [List of TCP and UDP port numbers](/source/List_of_TCP_and_UDP_port_numbers)

## References

1. ["Contract Between ICANN and the United States Government for Performance of the IANA Function"](http://www.icann.org/en/general/iana-contract-21mar01.htm), 21 March 2001, [archived](https://web.archive.org/web/20081226080420/http://www.icann.org/en/general/iana-contract-21mar01.htm) 2008-12-26 at the Wayback Machine

1. "6". "Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number Registry". August 2011.

## External links

- [IANA's official list of ports](https://www.iana.org/assignments/port-numbers)

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Adapted from the Wikipedia article [Registered port](https://en.wikipedia.org/wiki/Registered_port) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Registered_port?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.