Making requests | Documentation v2 | Email Verification API | WhoisXML API
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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.

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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.

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API 3.0 documentation

Making requests: API v2

NOTE: Email Verification API version 2 is being deprecated following the launch of version 3, which provides better stability and more accurate results. To learn more about the new version, please visit this specifications page.

  • End of Service (EOS) - After January 31 2024, our development team will stop providing fixes and technical support for this version.
  • End of Life (EOL) - After April 30 2024, this version will be discontinued and queries will no longer be served.

API endpoint

GET https://emailverification.whoisxmlapi.com/api/v2?apiKey=YOUR_API_KEY&emailAddress=support@whoisxmlapi.com
It takes up to a minute to activate your account after the registration.

Postman collection

Postman is a desktop and web application that allows you to make requests to an API from a graphical user interface. We recommend using Postman with WhoisXML APIs endpoints when exploring the APIs functionality, as well as when you are troubleshooting issues with your application.

The WhoisXML API Postman collection is available at the following links:

The collection includes a preconfigured environment. You will need to set up the api_key variable to fire each request. Get your personal API KEY on the My products page. If you have questions related to the API, contact us.

Input parameters: required

apiKey

Get your personal API key on the My products page.
emailAddress

The email address to be verified.

Input parameters: optional

outputFormat

Response output format.

Acceptable values: JSON | XML

Default: JSON
validateDNS

1 results in checking the email address with DNS.

Acceptable values: 0 | 1

Default: 1
validateSMTP

1 results in checking the email address with SMTP.

Acceptable values: 0 | 1

Default: 1
checkCatchAll

1 results in checking if the email provider has a catch-all email address.

Acceptable values: 0 | 1

Default: 1
checkFree

1 results in checking whether the email provider is a free one.

Acceptable values: 0 | 1

Default: 1
checkDisposable

1 results in checking if the address is disposable.

Acceptable values: 0 | 1

Default: 1
_hardRefresh

1 results in getting fresh data.

Acceptable values: 0 | 1

Default: 0
timeout

The maximum number of seconds that a request can be processed.

Minimum acceptable value: 5
cacheEmail

1 allows caching validation results for the faster performance. 0 enforces a strict no-cache policy.

Acceptable values: 0 | 1

Default: 1

Free access

After Sign Up you automatically get a free subscription plan limited to 100 queries.