Network tools guide
Port Checker
A port checker tests whether a particular network service can be reached through a port. This page is informational and does not scan or test ports.
What does a port check tell you?
A connection attempt may indicate that a service is reachable from the test location, but results depend on the target host, service configuration, firewall rules, routing, and whether the service is listening. TCP and UDP checks work differently, so a result for one protocol does not necessarily describe the other.
Check only authorized systems
Only test devices and services that you own or have explicit permission to assess. If you are troubleshooting your own service, verify the application is running and review its firewall and router configuration.