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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 February 2017 we had 400 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 (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 MX History tool returns all domains.

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