This question is often asked by newbies or customers…
Since Monday 15th September, there exists an “Internet server”! 🙂
All requests to an unknown, expired or misspelled domains will be redirected to a box called sitefinder.verisign.com (64.94.110.11). Nice place to run a honeyport btw…
See http://www.haque.net/verisign_dns_rant.php