YouGetSignal lets you discover which web sites are sharing a server
We recently discovered a new YouGetSignal tool: a reverse IP domain check. Just type a URL in the box, and YouGetSignal will attempt to discover other web sites using the same server. This comes in handy if you want to find URLs registered to a certain company, or if you have a shared hosting plan for your own web site and you want to see what other sites are sharing your server space.
For example, I discovered that there are 856 domains hosted on the same server as www.google.com, and 841 hosted on the same server as www.downloadsquad.com.