Reverse MX API checks associated domains via API calls | WhoisXML API
Products APIs Data Feeds Web Tools Domain Research & Monitoring Enterprise Packages
WHOIS / WHOIS History
WHOIS / WHOIS History

Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.

DNS / DNS History
DNS / DNS History

Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.

IP Geolocation / IP Netblocks
IP Geolocation / IP Netblocks

Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Access our web-based solution to dig into and monitor all domain events of interest.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.

Research
Monitoring
White-Label
WhoisXML API Predictive Threat Intelligence
Predictive Threat Intelligence

Detect and block access to and from dangerous domain names before malicious actors can weaponize them. Contact us today for more information.

WhoisXML API Internet Infrastructure
Internet Infrastructure

Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.

Enterprise API Packages
Enterprise API Packages

Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.

Security Intelligence (SI) Suite
Security Intelligence (SI) Suite

Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.

Multi-Level API User Administration Now Available - Manage individual API keys for team members in your organization.

Learn More
×
Contact Us
API docs Integrations Pricing

Reverse MX API tells which domain names use a certain mail server

Check which domains link back to a mail server via API calls to avoid hosts with a dubious reputation, improve email delivery, and other purposes.

Get started

500 free API credits. No credit card required.

50 Billion+Domains and subdomains
BillionsMX records
52,000+Satisfied customers
14+Years of data crawling

What is Reverse MX API?

A reverse MX API is a way to check if several domains can be found on a specified mail server through API calls. This information can help verify if a mail server is dedicated or shared across multiple hosts for cybersecurity and marketing ends.

Reverse MX API

Benefits

  • Comprehensive and up-to-date

    We provide results pulled from our large and constantly updated DNS database with millions MX records updated weekly for billions of domains and subdomains.

  • Fast response and easy integration

    Reverse MX API is a fast and easy-to-use API for quick access to domains with a shared mail server. All the results are duly parsed and normalized to a consistent format such as JSON and XML for easy integration into your business processes.

Practical usage

Blacklisting prevention

Blacklisting prevention

Prevent your mail server from being blacklisted and avoid harm to your email deliverability. Use Reverse MX API to identify bad hosts that may be involved in spamming, phishing, and other malicious activities.

Improve security

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

Reverse MX API gets its data from a huge passive DNS database

Our passive DNS repository contains billions of historical DNS records for billions of domains and subdomains. Access to our passive DNS database can help you find all there is to know about any Internet property and its DNS records.

Request a Quote
Reverse MX API | WhoisXML API

Get 500 free API credits. No credit card required.

Get started
Reverse MX API Reverse MX API

Sign up to get API access

Get free access to our API. 500 free credits. No credit card required.

Already have an account? Log In