Port Checker

Check whether a public host accepts a TCP connection on a specified port. Review open, closed or timed-out connections with My Secure Labs.

How to use Port Checker

Enter a public host and a TCP port from 1 to 65535, then complete verification and run the check. Supports public IPv4 and native IPv6 addresses. For a domain, choose Auto IP, IPv4 or IPv6; Auto prefers IPv4 and uses IPv6 for IPv6-only domains. IPv6 connections require IPv6 connectivity at the test location.

Understanding the results

An open result means a TCP connection was accepted. It does not confirm that the application behind that port is healthy. A timeout can reflect filtering; this check does not test UDP ports.

Does an open TCP port mean my website is working?

It means the host accepted a TCP connection on that port. Use HTTP Status for the web response and SSL Certificate for the HTTPS certificate. This tool does not test UDP.