A simple tool for checking open ports on any local or remote device. Useful for testing port forwarding settings on a computer. For example, if you encounter a problem connecting to a program using a network, it is possible that the port required by the application is blocked by a firewall or ISP. In such cases, port check can help you diagnose the problem. It can also be useful for security reasons if you are worried about whether a particular port is open or closed. For complete anonymity, we recommend to buy proxies.