PORT CHECKER

A simple and free online tool for checking open ports on your local or remote computer/device. It can be useful for testing port forwarding settings on your machine. For example, if you're having trouble connecting to a program (email, IM client, etc.), the port required by the application may be blocked by a firewall or internet provider. In such cases, this tool can help you diagnose the issue. It may also be useful for security reasons if you're concerned about whether a specific port is open or closed.