Strange URL Configuration: domain.com at 12345

[Ron Parker]

I received spam today with a response url:

    http://www.rankingtothetop.com@1078106110/

Funny thing is, this works!  My questions:

1. How does this work (i.e., I enter this into my browser and the page
comes up).
2. How do I decipher this to find out what the IP is for this site (or
real domain name) or ISP so I can complain about the spam.

Thanks, much.

-ron

--
Ron Parker
Software Creations            http://www.scbbs.com
TradeWinds Publishing         http://www.intl-trade.com
TradePoint Los Angeles        http://www.tradepointla.org
SiteDirector Security Server  http://livepublish.scbbs.com
Civil War Online Library      http://civilwar.scbbs.com