If you're behind router
ipconfig command will only show LAN address, not the public WAN address allocated to your cable connection.
Read more here:
http://homepage.ntlworld.com/robin.d...ps/ipaddr.html
In this case, you may either use my previous link, or
http://www.ip-adress.com/ (it'll show you more details, and a map of your location), or go here:
http://www.broadband-help.com/tools/clientInfo.aspx
and look at
Best guess at your IP under "Network.