if NT4, Windows 200, or windows XP, goto a command prompt and type "ipconfig". If 95/98 then type "winipcfg". You can get more detailed info by typeing "/all" after the command (eg. "ipconfig /all")
...or visit : http://www.whatismyipaddress.com
& remember you may not have a permanent IP address - your ISP may assign you a new IP address ( from its pool of addresses )whenever you log-on.
Just make use of this site http://www.ip-details.com/ip-search/ for Checking The Ip address of your PC.
i Used this site for checking the IP Address , this site provides information at cheap cost