Tool
NAT Type Checker
Estimate whether your current path looks closer to Open, Moderate, or Strict by combining public IP data, router WAN clues, an optional port check, and a lightweight browser STUN probe.
NAT
NAT Type Checker
How this checker works
This is a best-effort browser estimate. RouterWiz combines your public IP, optional router WAN IP, an optional port check, and a lightweight WebRTC STUN probe. It is more practical than a raw NAT label, but it is not a perfect console-grade classification.
See the flow visually
A NAT label matters only when it points to the next fix
NAT type preview
The RouterWiz verdict is meant to narrow the next move, not to stop at a single label. A Strict-like path usually points to CGNAT or Double NAT. A Moderate path pushes you back toward the rule, firewall, or listener.
- Strict-like often means you should inspect the upstream path before touching more router rules.
- Moderate usually means the path is routable, but your service setup still needs verification.
- Open-like means the public side already looks healthy enough to move higher in the stack.