Port 1812 — RADIUS auth
Quick reference for TCP/UDP port 1812, used by RADIUS auth. Includes what the service does, security guidance and related ports.
Port
1812
Protocol
UDP
Service
RADIUS auth
What is port 1812?
RADIUS authentication.
What port does RADIUS auth use?
RADIUS auth listens on port 1812 by default.
Security guidance
Medium risk — open with care
Port 1812 (RADIUS auth) 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.
Related ports
Frequently asked
What is port 1812 used for?+
Port 1812 is the standard TCP/UDP port for RADIUS auth. RADIUS authentication.
What port does RADIUS auth use?+
RADIUS auth listens on port 1812 by default.
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