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Reverse MX History

Find domains using a mail server (MX record) in the past.

Reverse MX History

Find historical connected domains to a mail server (MX record).

Enter mail server. Example: alt1.aspmx.l.google.com

Tool description

Find domains using a mail server (MX record) in the past. It shows a maximum of 2,500 previous connected domains to a mail server (depending on your membership type). Just type a mail server and click the Go button. If you are looking for the MX 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 mail servers.
  • Monitor removed and unregistered domains on mail servers of competitors.


Q: How many MX history records do you have?
A: On November 2020 we had 700 million MX history records on file.

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

Q: How many mail servers do you have?
A: We have 55+ million active mail servers and 40+ million inactive mail 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 MX History tool returns all domains.

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

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