Well-known · Linux/Unix

525 timed

TCP —
UDP Yes
SCTP —
DCCP —

What it is

Time server daemon.

When / why

Superseded by NTP.

Protocol status detail

TransportStatusMeaning
TCP — Not applicable for this transport.
UDP Yes Assigned by IANA and standardized, specified, 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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