Click on Windows "Start" button then, in “search" box type "cmd". Press enter. A 'dos' window will appear. Type "ipconfig" and press enter. Windows IP Configuration information will show. This information will contain your IP address. It may be listed as "IPv4" address. To go out from the 'dos' window, type "exit" at blinking cursor.

If you are at the back of a proxy or local gateway you will not get your IP with "cmd". Go to web site ip.nf and you will get your IP. The second technique always works.