Port 3478 — STUN / TURN
Quick reference for TCP/UDP port 3478, used by STUN / TURN. Includes what the service does, security guidance and related ports.
Port
3478
Protocol
TCP/UDP
Service
STUN / TURN
What is port 3478?
NAT traversal for VoIP and WebRTC.
What port does STUN / TURN use?
STUN / TURN listens on port 3478 by default.
Security guidance
Medium risk — open with care
Port 3478 (STUN / TURN) 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 3478 used for?+
Port 3478 is the standard TCP/UDP port for STUN / TURN. NAT traversal for VoIP and WebRTC.
What port does STUN / TURN use?+
STUN / TURN listens on port 3478 by default.
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