Reverse IP lookup @ WhatIsOnIp.com

Find sites running on the same IP or on the same IP class. We have 159,913,063 domains and 8,691,732 unique IPs in DB.

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How to search:
85.10.246.235 - search for the sites hosted on an IP address
85.10.246 - search for the sites hosted on a class of IP addresses
pagepeeker.com - see on what ip runs a site and what other sites run on the same IP
reverse:hostgator.com - check out the domains who have a certain reverse DNS