Find your computers IP address. If you are using port forwarding to open up the NAT settings, you will need your computer’s IP address as well as the ports that need to be opened. To find your computer’s IP, go to the Windows Start Menu and type ‘cmd. exe’ into the run box without the quotes. When the command utility opens up, type in ipconfig. This will give you information on your computer and what it’s IP address is. The vast majority of the time, your IP address when connected through the router will share the first three number groups as the router itself. For example, on a Linksys router your computer would have an IP of 192. 168. 1. x, with x being the unique digit.