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The method referred to as reverse IP research is a manner to perceive hostnames that have DNS (A) facts related to an IP cope with.
An internet server can be configured to serve multiple virtual hosts from a unmarried IP cope with. That is a common technique in shared web hosting environments. It's also not unusual in lots of groups and may be an extremely good manner to amplify the attack surface in the course of reconnaissance of an internet server. If as an instance, your number one goal net site seems to be secure, you may be able to benefit get entry to to the underlying running machine via attacking a much less secure web page at the equal server. Doubtlessly bypassing the safety controls of the goal web site.