^^ How do people know if it's an @Home IP also?

Try http://www.dnsstuff.com

I hope this helps.

do a search on download.com for Neo Trace

It is a really cool program, shows you not only where the IP resolves but where on a map of the world it goes.

Sorry for the lack of grammar, im running on fumes here.

Real geek (hardcore) way:

1.) do a traceroute to the IP you want to lookup and review the path data travels.

2.) lookup the host name (nslookup ip)

3.) lookup arin.net IP database

Or this one: http://xpenguin.com/plot.php

http://www.visualware.com/visualroute/livedemo.html