Holy Shit! Check this out.

Re:

http://www.hipforums.com/forums/showthread.php?t=144516

Check out the entry on May 22, 2006
at 01:41 am (Eastern Time for me, maybe different for you)
By Myranya.

In her signature is a banner
That shows your IP address
Your Internet Service Provider
And your operating system (Windows XP for example)

Sorry for the foul language,
but HOLY SHIT.

PS - to confirm that it's your IP address
go to http://www.whatismyipaddress.com/

 

You've never seen this before? Its a very simple technology actually.