While connected to the router go Start then Run in XP - (Windows key plus R in Vista and Windows 7), then type in the following, including all the spaces:- cmd /k ipconfig /all -- then press Enter and from the black form that shows up, take a note of the numeric code beside the word "gateway" -- usually something like 192.168.1.1. Type exit to close the black form.
You can find your routers ip address by two ways:
1) If you visit http://www.ip-details.com/ it displays your ip address along with latitude,longitude,city etc
2) You can also check with the help of the steps mentioned below:
> Press Windows + R button in your system.
> Type cmd in the dialogue box which appears and press OK
> Type ipconfig and press enter
It displays your routers ip address.