Port 1 — tcpmux
Quick reference for TCP/UDP port 1, used by tcpmux. Includes what the service does, security guidance and related ports.
Port
1
Protocol
TCP/UDP
Service
tcpmux
What is port 1?
TCP Port Service Multiplexer.
What port does tcpmux use?
tcpmux listens on port 1 by default.
Security guidance
Medium risk — open with care
Port 1 (tcpmux) 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 1 used for?+
Port 1 is the standard TCP/UDP port for tcpmux. TCP Port Service Multiplexer.
What port does tcpmux use?+
tcpmux listens on port 1 by default.
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