It is well known that if your site is hosted with some of the spam websites then you might get into some kind of trouble.

But the question is, how to find out who’s there? MyIPNeighbors.com is a handy tool to look-up the sites which are hosted on a specific server. Say, for example - you enter wikipedia.org and you receive wikibooks.org, uk.wikipedia.org, es.wikipedia.org, aa.wikipedia.org and many more, all thanks to a reverse IP domain check, as the site explains. (And if you happen to detect that your server is crammed with questionable content – like hundreds of SEO spam domains – you might want to look for another host…)

MSN search is also having a similar tool; the “IP” operator. Type “IP:” followed by an IP address**, say ip: 66.230.200.100, and MSN will show you other sites hosted on the server.

check your IP, IPtool