Port 37 — time
Quick reference for TCP/UDP port 37, used by time. Includes what the service does, security guidance and related ports.
Port
37
Protocol
TCP/UDP
Service
time
What is port 37?
Time protocol returning seconds since 1900 (RFC 868).
What port does time use?
time listens on port 37 by default.
Security guidance
Medium risk — open with care
Port 37 (time) can safely face the internet if you keep the software up to date, restrict admin endpoints, and use TLS where possible. Audit who can reach it and watch your logs.
Frequently asked
What is port 37 used for?+
Port 37 is the standard TCP/UDP port for time. Time protocol returning seconds since 1900 (RFC 868).
What port does time use?+
time listens on port 37 by default.
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