# Open Port Checker

> Free online open port checker

Market: Worldwide
Main language: en
Last updated: 2026-09-08

## About
Tests whether a TCP or UDP port is reachable from outside, for verifying port forwarding and troubleshooting firewalls and routers.

## Links

Full listing: https://adspotfinder.com/open-port-checker
Website: https://portchecker.cc
About this data: https://adspotfinder.com/llms.txt