Port Number Assignments

However, many unofficial uses of both well-known and registered port numbers occur in practice.

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In most cases, these applications run as ordinary programs that can be started by nonprivileged users.

The registered port numbers are in the range from 1024 through 49151.

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.

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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.

User Ports are assigned by IANA using the "IETF Review" process, the "IESG Approval" process, or the "Expert Review" process, as per [RFC6335]. The registration procedures for service names and port numbers are described in [RFC6335].

Assigned ports both System and User ports SHOULD NOT be used without or prior to IANA registration.

Examples of applications with registered port numbers include Sun's NEO Object Request Broker (port numbers 10) and Shockwave (port number 1626).

Besides the well-known port numbers and the registered port numbers, the remaining ports in the port number spectrum are referred to as dynamic ports or private ports and are numbered from 49152 through 65535.

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