3 entries are registered on port 3478. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.
services registered on this number
2 transports in use
entries encrypted on the wire
3 of 3 iana-registered
| port | service | proto | category | risk | views |
|---|---|---|---|---|---|
| :3478 | STUN | TCPUDP | Network Services | caution | 7.0k |
| :3478 | STUN / TURN | TCPUDP | Network Services | caution | 0 |
| :3478 | TURN (Traversal Using Relays around NAT) | TCPUDP | Network Services | caution | 0 |
Session Traversal Utilities for NAT (STUN) is a protocol that enables applications to discover their public IP address and the presence and type of network address translator (NAT) they are behind. This facilitates communication between devices located behind different NAT devices, which is crucial for peer-to-peer applications like voice and video chat.
port 3478 as STUN →STUN and TURN commonly use port 3478 for NAT discovery and relaying; the IANA handle specifically denotes STUN behavior discovery over TCP.
port 3478 as STUN / TURN →TURN relays traffic for clients that cannot establish a direct connection, commonly supporting WebRTC and VoIP.
port 3478 as TURN (Traversal Using Relays around NAT) →The registry says what 3478 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.
ss -ltnp | grep ':3478\b'lsof -nP -iTCP:3478 -sTCP:LISTENnetstat -ano | findstr :3478On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 3 entries above.
A port number is not a service. Anything may listen on 3478 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.
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