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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.


Q: How many NS history records do you have?
A: On February 2017 we had 900 million 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 (ex com, net, org) and nTLD (ex xyz, berlin, nyc) daily zone files. For ccTLD (ex de, fr, eu) our coverage is between 50% and 80% depending on the ccTLD.

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

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