A registered port is a

network port In computer networking, a port is a number assigned to uniquely identify a connection endpoint and to direct data to a specific service. At the software level, within an operating system, a port is a logical construct that identifies a specific ...

designated for use with a certain protocol or application. Registered port numbers are currently assigned by the

Internet Assigned Numbers Authority The Internet Assigned Numbers Authority (IANA) is a standards organization that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet ...

(IANA) and were assigned by

Internet Corporation for Assigned Names and Numbers The Internet Corporation for Assigned Names and Numbers (ICANN ) is an American multistakeholder group and nonprofit organization responsible for coordinating the maintenance and procedures of several databases related to the namespaces ...

(ICANN) before March 21, 2001, and were assigned by the

Information Sciences Institute The USC Information Sciences Institute (ISI) is a component of the University of Southern California (USC) Viterbi School of Engineering, and specializes in research and development in information processing, computing, and communications techno ...

(USC/ISI) before 1998. Ports with numbers 0–1023 are called ''system'' or ''

well-known port This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for duplex, bidirectional traffic. They usually us ...

s''; ports with numbers 1024-49151 are called ''user'' or '' registered ports'', and ports with numbers 49152-65535 are called ''dynamic'', ''private'' or ''

ephemeral port An ephemeral port is a communications endpoint (port) of a transport layer protocol of the Internet protocol suite that is used for only a short period of time for the duration of a communication session. Such short-lived ports are allocated autom ...

s''. Both system and user ports are used by transport protocols ( TCP, UDP,

DCCP In computer networking, the Datagram Congestion Control Protocol (DCCP) is a message-oriented transport layer protocol. DCCP implements reliable connection setup, teardown, Explicit Congestion Notification (ECN), congestion control, and feature n ...

SCTP The Stream Control Transmission Protocol (SCTP) is a computer networking communications protocol in the transport layer of the Internet protocol suite. Originally intended for Signaling System 7 (SS7) message transport in telecommunication, the p ...

) to identify an application or service.

References

External links

IANA's Official list of ports
Internet protocols {{Compu-network-stub

See also

References

External links