Tool
NAT Path Checker
Compare your current public IP with the WAN IP shown inside your router to quickly judge whether Double NAT or CGNAT is the bigger blocker.
NAT
NAT Path Checker
Checking your current public IP...
See the flow visually
Inbound failures often start one layer above the port rule
NAT path preview
If the router itself is sitting behind another NAT device, the port rule can look correct while the public side never reaches it.
- A private WAN IP usually points to Double NAT.
- A 100.64.0.0/10 WAN IP strongly suggests CGNAT.
- A matching WAN IP and public IP usually means you should inspect port rules, firewall, or the service itself next.