Port Check Tool

Test whether TCP ports are open and reachable on a host from our server. Enter a hostname or IP and a comma-separated port list (leave blank to scan common ports).

What an open port means

An open port means a service is actively listening and accepting TCP connections on that host — for example port 443 for HTTPS or 22 for SSH. A closed or filtered port means no service answered, either because nothing is listening or a firewall blocked the attempt. This test connects from our server, so results reflect public reachability, not your local network.

Up to 100 ports are checked per request. Only scan hosts you own or are authorised to test.