I don't know if this helps or not, but you can go to...
http://www.whatismyip.com and it will show you what your IP is. However, this will only show the apparent IP you're browsing from. So if you're behind a router, then it will only show the IP of the router and not the ip of your specific box. If you need to know the specific IP of your box, you shoudl be able to go to /etc/hosts and see if the IP is listed in there.