Home -> Reverse Tools -> MX Neighbors

MX Neighbors

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

MX Neighbors

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

Enter mail server, domain name, IP address (IPv4 and IPv6) or subnet. 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 2,500 connected domains (depending on your membership type). For subnets it shows a maximum of 255 IP addresses. Just type a mail server, domain name, IP address or subnet and click the Go button. Both IPv4 and IPv6 addresses are supported. For the subnet view you have to type the subnet in the form of x.x.x for IPv4 subnets and x:x:x:x for IPv6 subnets.

Example objectives

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

FAQ

Q: How do you decide a mail server is hosted on an IP address?
A: First we identify a mail server when it is actually configured in the DNS for a domain. For example if mail.domain.com is a MX record for domain.com, we identify mail.domain.com as a mail server. After we identify a mail server we perform an A and AAAA lookup of the mail server.

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.

Tools for you

Your public IP Address

Information about your public IP Address like reverse dns, hosting info and whois data.

my IP Address for Windows 8.1 & 10

This app shows detailed information about your IP Address, your domain and your provider.

Other services

Browser Addons

Our collection of browser extensions and apps.

Premium API

Premium API enables access for 3rd party services to our content and tools.

Premium Website Access

Premium website access is for the IT professional. You get extra page views, more alerts and extra features.