You can test your port forwarding by following some simple steps. First, make sure that the port forwarding is properly set up and that the required port is configured with the service that you are running on your device. Then, find your public IP address and enter it into our port checker along with the number of the port that you’ve configured. For example, your public IP address could be 12.34.56.78, and the port number could be 25. The port checker will let you know whether that particular port for the IP address is open, closed, or filtered.