Reveal all domains
that use the same mail server

Reverse MX Domains using it Mail server domain 1 domain 2 domain 3
Domains and subdomains
MX records updated daily
Satisfied customers

Blacklisting prevention

Prevent your mail server from being blacklisted. Hosts with dubious reputation may affect email delivery. By using the Reverse MX API service you can identify spamming, phishing and other poor reputation sites on your host.

Improve security

  • Uncover connected domains that may otherwise seem unrelated.
  • Analyze mailing functions of any organization to gather clues about its structure and security vulnerabilities.
  • Do your research on potentially malicious mail servers.

Easy integration

A fast and easy-to-use API for quick access to the largest database. All the results are duly parsed and normalized to a consistent format such as JSON and XML to easily integrate with your business processes.

Enterprise API Packages

API access through WhoisXMLAPI can be purchased as an annual subscription. The access pricing is based on the number of queries, which is measured monthly with per-minute rate limits. The pricing structure gives predictability to business planning and solution architecture.

Learn more

Trusted by
the smartest

Give the API a Try

Input correct mail server address

Try our Reverse MX API for free
Get started
Have questions?

We work hard to improve our services for you. As part of that, we welcome your feedback, questions and suggestions. Please let us know your thoughts and feelings, and any way in which you think we can improve our product.

For a quick response, please select the request type that best suits your needs. For more info regarding the request types, see the Contact us page.

By submitting, you agree to the Terms of Service and Privacy Policy.

Or shoot us an email to