Reverse IP lookup on webserver

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Autor: Don Calfa
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Assunto: Reverse IP lookup on webserver
Is there a tool somwhere that can give you a lookup as to how many sites
are hosted on a single IP address?

There is one that I use but it's only limited to 100 Ip addresses.

There obvisoulsy is a database (DNS and/or other search engines) that
have this info already.