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Reverse NS History

Find domains using a name server (NS record) in the past.

Reverse NS History

Find historical connected domains to a name server (NS record).

Enter name server. Example: ns1.google.com

Tool description

Find domains using a name server (NS record) in the past. It shows a maximum of 2,500 previous connected domains to a name server (depending on your membership type). Just type a name server and click the Go button. If you are looking for the NS history of a single domain, you must use our Hosting History tool.

Example objectives

  • Discover historical relations like ownership between domain names.
  • Perform research on malicious name servers.
  • Monitor removed and unregistered domains on name servers of competitors.

FAQ

Q: How many NS history records do you have?
A: On November 2020 we had 2+ billion NS history records on file.

Q: How often do you resolve the NS records for a domain?
A: Our DNS crawlers try to resolve every domain name once per month.

Q: How many name servers do you have?
A: We have 6+ million active name servers and 40+ million inactive name servers on file.

Q: How many domains do you have?
A: We have access to all gTLD (com, net, org etc.) and nTLD (xyz, berlin, nyc etc.) daily zone files. For ccTLD (de, fr, eu etc.) our coverage is between 50% and 80% depending on the ccTLD.

Q: Is this tool available for all Top Level Domains?
A: Yes, the Reverse NS History tool returns all domains.

Q: A domain returned by the Reverse NS History tool is currently using that name server. How is that possible?
A: The results of this tool are constructed by all our archived NS records. A NS record is archived when our DNS crawler no longer finds it. For example a domain is using a different name server, dropped from the zone file or the DNS server is unreachable. In those cases the NS record is archived and the domain is returned by this tool. It is possible after a certain period a domain is using the original name server again.

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