When you open the application on your Android device, you can find the port number below after the mobile IP on a purple background. Usually it is 4444. If you need the port number for your computer, go to Start, type cmd and open the utility using Administrator rights. Type ipconfig and press the Enter key. Copy the IP address associated with the Default Gateway entry from the IPConfig results on your browser and you can find the port numbers in Port Forwarding menu. Also, in CMD, after your IPConfig results, you can type netstat -a and to press Enter. The port numbers appears linked after the IP address.