NAT Type
Detects your NAT type by gathering WebRTC ICE candidates in your browser. Tells you whether you are on open internet, behind NAT, relayed through TURN, or on symmetric or UDP-blocked — useful for peer-to-peer apps and online gaming.
Frequently asked questions
- Why does NAT type matter?
- NAT (Network Address Translation) lets your router share one public IP across many devices. Strict NAT types break peer-to-peer features in online games, voice calls, and file sharing.
- What do the types mean?
- "Open Internet" means no NAT (best for P2P). "Behind NAT (srflx)" is normal consumer routing and works for most apps. "Symmetric NAT" or "UDP blocked" breaks most P2P — you may need to change router or ISP.
- Can this tool fix my NAT?
- No, it only detects the type. To improve it, enable UPnP on your router, configure static port forwarding, or ask your ISP for a public IPv4 instead of CG-NAT.