Network Address Translation (NAT) controls how devices on private networks connect to the public internet. NAT behavior can affect multiplayer games, voice chat, peer-to-peer tools, and inbound connections.
Click NAT Checker to run a browser-based NAT type check. The result gives a useful starting point for troubleshooting router configuration, firewall rules, and connectivity between peers.
This overview is general technical information and is not a substitute for guidance from an ISP or network administrator.