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Session Traversal Utilities for NAT
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Application Layer — VoIP & Streaming
Protocol Overview
Full Name
Session Traversal Utilities for NAT
Abbreviation
STUN
OSI Layer
Application Layer
Category
VoIP & Streaming
Default Port
3478, 5349
RFC
RFC 8489
About STUN
Protocol that discovers public IP addresses and NAT types. Used by WebRTC, VoIP, and peer-to-peer applications to establish direct connections through NAT.
Application Layer
VoIP & Streaming
Port 3478, 5349
Standards Reference
STUN is defined in RFC 8489, published by the Internet Engineering Task Force (IETF). RFCs are the official standards documents for internet protocols and are freely available for public review.