Port 3478

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
TCP UDP Ports
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