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**STUN** (Session Traversal Utilities for NAT) is an auxiliary protocol for transmitting data around a {{glossary("NAT")}} (Network Address Translator). STUN returns the {{glossary("IP address")}}, {{glossary("port")}}, and connectivity status of a networked computer behind a NAT.
## See also
- [STUN](https://en.wikipedia.org/wiki/STUN) on Wikipedia