Ports Open Checker - is a simple and free online tool for checking open ports on your computer
or remote computer / device will be useful when testing port forwarding settings on a machine.
For example, if you encounter a problem connecting to the program (e-mail, IM client, etc.), it
is possible that the port required by the application is blocked by a firewall or ISP, in such
cases this tool can help you diagnose the problem . This can also be useful for security reasons
if you are worried about whether a particular port is open or closed.