Port 3478 is typically used for STUN (Session Traversal Utilities for NAT) protocol. STUN is used to help clients communicate with servers when they are behind a NAT (Network Address Translation) device. This port is also sometimes used for TURN (Traversal Using Relay NAT) protocol, which is used when STUN is not successful in establishing a direct connection between the client and server. TURN uses a relay server to facilitate communication between the two devices.
Ports those registered with IANA are shown as official ports. The same port number may be unofficialy used by various services or applications. The official usage are listed separately below its usage may change from time to time.
Official
Port |
Protocol (TCP/UDP) |
Title |
Description |
Port Type |
Port 3478 |
tcp |
stun |
Session Traversal Utilities NAT |
REGISTERED PORT |
Port 3478 |
udp |
stun |
Session Traversal Utilities NAT |
REGISTERED PORT |
Port 3478 |
tcp |
stun-behavior |
STUN Behavior Discovery TCP |
REGISTERED PORT |
Port 3478 |
udp |
stun-behavior |
STUN Behavior Discovery UDP |
REGISTERED PORT |
Port 3478 |
tcp |
turn |
TURN over TCP |
REGISTERED PORT |
Port 3478 |
udp |
turn |
TURN over UDP |
REGISTERED PORT |
UnOfficial
Unofficialy or sometimes with conflict, the same port may be used by different applications.
| Port | Protocol (TCP/UDP) | Description |