Free tool
Port checker
Check whether a TCP port is open and accepting connections on any host — straight from our servers, so results reflect its public reachability.
Common ports:
Port
·
What does the port checker do?
It opens a TCP connection to a host and port to confirm a service is listening and reachable from the public internet — handy when opening a firewall or debugging a service that won't connect. The probe runs from our server, not your browser, so a result reflects the host's public reachability rather than your local network.