Open Port Checker
Port Checker is a simple tool to check for open ports and test port forwarding setup on your router. Verify and diagnose connection errors on your computer.
Open Port Checker launched on August 23, 2014 with 19 votes and more than 75% of that year's launches. The site was still online in September 2026, 12 years on.
In plain words
Open Port Checker is a free online tool that checks for open ports on a computer or device and tests port forwarding configuration on routers. It helps users diagnose connection problems caused by blocked ports, firewall settings, or ISP restrictions that may prevent applications like email clients from functioning properly. The tool is useful for both troubleshooting network issues and security verification purposes.
written from the facts on this page · September 2026
From the sources
Check for open ports and verify port forwarding setup on your router. Port Checker is a simple and free online tool for checking open ports on your computer/device, often useful in testing port forwarding settings on a router. For instance, if you're facing connection issues with a program (email, IM client etc) then it may be possible that the port required by the application is getting blocked by your router's firewall or your ISP . In such cases, this tool might help you in diagnosing any problem with firewall setup . You could also find this useful for security purpose, in case you're not sure whether a particular port is open or closed. If you host and play games like Minecraft, use…from portchecker.co
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Open Port Checker2024 · openport.net · ▲2Port Checker, Online Port Checker, Free Online Port Checker
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