NAT type test
Find out whether your connection is likely to show Open, Moderate or Strict NAT in games and calls, and how to fix a strict NAT type.
Online games and voice chat connect players directly whenever they can. Your router's NAT, the system that shares one public address among your devices, decides how easy that is. Consoles sum it up as Open, Moderate or Strict (Type 1, 2 or 3 on PlayStation).
How the test works
Your browser asks two different public STUN servers, one run by Google and one by Cloudflare, which address and port they see. If both see the same port, your router keeps one mapping for everyone, which is what games want. If each sees a different port, your router uses symmetric NAT, which games report as strict.
How to fix a strict NAT
- Turn on UPnP in your router settings, so games can open the ports they need. See how to log in to your router.
- Forward the game's ports to your console or PC, and give that device a fixed local address.
- Remove double NAT. If you have two routers, put the provider's box in bridge mode.
- Check for CGNAT. If your provider shares one public address among many homes, nothing in your house can fix it. Ask for a public IPv4 address. See what CGNAT is.
- Turn off any VPN while gaming. Many VPNs give you a strict NAT.
Limits
A browser can tell game-friendly NAT from strict NAT, but it can't tell every type apart, and consoles run their own tests. Treat this as a strong hint, then confirm in your console's network settings after making changes. With a VPN on, the result describes the VPN's network, not your home's.
Last updated October 2026.