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MX Neighbors

Find domains sharing the same MX record (mail server).

MX Neighbors

Find domains sharing the same MX record (mail server).

Enter mail server or domain name. Example: tcpiputils.com or alt1.aspmx.l.google.com

Tool description

Every domain name capable of receiving emails has one or more mail servers (MX record). Use this tool to find domains sharing the same mail server. It shows a maximum of 1,000 connected domains. Just type a mail server or domain name and click the Go button.

Example objectives

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


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 50+ million active 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 40% and 70% depending on the ccTLD.

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

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