STUN (Session Traversal Utilities for NAT) is a standardized set of methods, including a network protocol, to discover how a network application's public IP address and port are mapped when it is behind a network address translator (NAT). It is commonly used in real-time communication applications like VoIP, video conferencing, and online gaming to allow devices behind NATs to discover their external IP address and port, and to establish connections with other devices.
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