How to find the domains hosted on an IP address

With virtual hosting, a single IP address can host dozens of domains, and it can be interesting to find out what other domains are being hosted on the same server. Windows live search lets you use the ip: prefix to search for all the domains on a given IP address.

For example, resolves to 2 IP addresses: and, but as you can see, hundreds of domains are hosted on them. provides a similar tool they call reverse IP (requires a free membership). They search through all the class A domain names and find all the ones that resolve to the same IP address. It found over 3,200 domains on the first IP address.

From the looks of it, Yahoo wants to keep other people from registering yahoo-related domain names by scooping them all up themselves.

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