Reverse MX

Find domains sharing the same mail server.

Use the Reverse MX Tool for:

  • Perform research on malicious mail servers.
  • Discover relations like ownership between domain names.
  • Monitor new and removed mail servers on IP addresses.
  • Discover mail servers on the same subnet.

Our Statistics

60+ million Mail Servers
  Premium Only
3+ billion historical MX Records
330+ million Active Domains
  Premium Only
10+ years of historical records

Frequently Asked Questions

How do you decide a mail server is hosted on an IP address?
We perform an A and AAAA lookup of every mail server we discover.
What happened to the previous Reverse MX Tool?
The Reverse MX Tool is now integrated in the new Domain Search interface. With the new interface you can search for domains on many different fields like name, MX/NS records and provider. See examples below!
How often do you resolve IP/DNS records for a domain?
Our DNS crawlers try to resolve every domain name every two weeks.


Domains using MX record "route1.mx.cloudflare.net"
Domains with TLD .nl using MX "route1.mx.cloudflare.net"
  Premium Only
Historical Domains using MX "route1.mx.cloudflare.net"
  Premium Only
Domains using MX with IP ""
  Domain -  History