Open source · Networking
CGNAT Inspector
Linux CLI that tells you, with evidence, whether you are behind carrier-grade NAT.
Technology
- Shell
- Linux
Overview
CGNAT Inspector answers one question — “Am I behind Carrier-Grade NAT?” — by running several independent tests rather than relying on a single guess.
Problem
Carrier-grade NAT breaks self-hosting, port forwarding and remote access, and it is often hard to confirm from a single check.
Approach
Combine several independent tests into one verdict, and keep the tool dependency-light so it runs on any Linux box.
Key engineering decisions
- Dependency-light by design, so it can run on minimal servers and home-lab machines.