Why other search engines don’t do this is beyond me, however I would have to put a tick firmly in the Bing box with this little gem.
Using the example above for car insurance provider Hastings Direct, one can see the sites that are hosted on the same box as Hastings. As you can see a number of sites are hosted on the same IP as hastingsdirect.com.
This can be done on any of the other sites you want, for example
To run this on a particular IP simply type the following syntax into the bing query box
ip: [ip address]
[Original Source Blogoscoped ]