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Is it possible to get all the domain names assigned to an IP address?

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I know this has been asked more than once already but I can't for the life of me find any of the others. – John Gardeniers Oct 15 '10 at 0:09
It's not a "direct" solution, but there are companies out there that aggregate network information. has a tool that will list all of the domains they know of that direct to a given IP address. It's not 100% accurate or fail-safe, but it's a good place to start. – Justin Scott Dec 20 '10 at 15:19
up vote 8 down vote accepted

No, not generally. The DNS system was not designed for this kind of one-to-many search, just many-to-one. It may be specifically possible if you know all the domains are hosted by a single DNS provider, and even then it may not be doable.

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To add to what sysadmin1138 has said, there are really only two possible ways to do this.

  1. Do a forward lookup on every possible domain name, including all possible subdomains if that is relevant to you.
  2. Do a reverse lookup on the IP address.

Number 1 is clearly impossible due to the number of lookups needed, plus much of the data would probably be invalid before you get even a few percent into the list.

Number 2 may work in some cases but in general not every forward lookup has a corresponding reverse lookup, which means you cannot get the complete list.

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Use Bing with the query "IP:". For example.

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I know but I was looking for direct independent solution. – ilhan Oct 15 '10 at 3:39
Wrong. Despite appearances, that will NOT achieve the desired results. As a check I just tried it using an IP address under my control that has 5 domains and Bing return zero results. There are no reverse lookups configured for any of those domains, so there's no way to look them up. – John Gardeniers Oct 15 '10 at 4:02

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