// REFERENCE
Port 3478 (STUN / TURN)
Protocol: UDP/TCP
Service: STUN/TURN
Low risk
STUN/TURN: helps traverse NAT in WebRTC and VoIP (video calls). An open, unauthenticated TURN server can be abused as a free relay to bounce others' traffic.
Related tools
Work with this in:
Related
111
Port 111 (RPCbind / Portmapper) 135
Port 135 (MSRPC) 137
Port 137 (NetBIOS Name) 138
Port 138 (NetBIOS Datagram) 1883
Port 1883 (MQTT) 2375
Port 2375 (Docker API)
Port 111 (RPCbind / Portmapper) 135
Port 135 (MSRPC) 137
Port 137 (NetBIOS Name) 138
Port 138 (NetBIOS Datagram) 1883
Port 1883 (MQTT) 2375
Port 2375 (Docker API)
Assignments per the IANA port registry. Educational content.