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Steve
Also, out of sheer curiousity if your subjects ip address is something like 216.17.75.251 then i'd start going to placed like [216.17.75.252,...] 253, etc. Just to see if there are any dedicated sites that have been parked by the hosting company.
You might want to also try just SSH'ing, Telnet'ing, FTP'ing into the IP address to see if there are any clues around. You should be able to turn up something with enough digging.
Good luck.