Well-known · Cross-platform

113 Ident

TCP Yes
UDP No
SCTP —
DCCP —

What it is

Identification protocol historically used by IRC and mail servers.

When / why

Mostly legacy; some daemons still query it during connection setup.

Protocol status detail

TransportStatusMeaning
TCP Yes Assigned by IANA and standardized, specified, or widely used on this port.
UDP No Not assigned, standardized, or widely used on this port.
SCTP — Not applicable for this transport.
DCCP — Not applicable for this transport.
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Port range

Well-known (0–1023). System port for a core service. On Unix-like systems, binding it requires superuser privileges.

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