A registered port is a network port (a sub-address defined within the Internet Protocol, in the range 1024–49151) assigned by the Internet Assigned Numbers Authority (IANA) (or by Internet Corporation for Assigned Names and Numbers (ICANN) before March 21, 2001, or by USC/ISI before 1998) for use with a certain protocol or application.
Ports with numbers 0–1023 are called system or well-known ports; ports with numbers 1024-49151 are called user or registered ports, and ports with numbers 49152-65535 are called dynamic and/or private ports. Both system and user ports are used by transport protocols (TCP, UDP, DCCP, SCTP) to indicate an application or service.
- Ports 0–1023 – system or well-known ports
- Ports 1024–49151 – user or registered ports
- Ports >49151 – dynamic / private ports
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