Disclaimer

Best-effort results only

The checker uses browser-visible information and a manual WAN IP entry. That can highlight strong signs of CGNAT or a NAT mismatch, but it cannot conclusively prove every network topology, firewall policy, or ISP implementation.

Commercial relationships do not guarantee fit

Advertising, sponsorships, or affiliate links may appear on parts of the site. Those relationships do not mean a product is automatically suitable for your protocol, security model, audience, or ISP setup. Free or simpler options can still be the better answer.

ISP guidance is intentionally cautious

ISP pages on this site are written carefully and should not be interpreted as definitive claims about every customer, region, or plan. Network behavior can vary and should be verified directly with the ISP.

Security matters when you expose services

Remote desktops, cameras, NAS interfaces, game servers, and administrative tools should not be exposed casually to the public internet. You remain responsible for authentication, patching, firewall rules, and the safe configuration of any service you make reachable.

No substitute for direct verification

If inbound connectivity matters for your work or business, confirm the details with your ISP, router vendor, and service documentation before making purchase or hosting decisions.