Domain Availability API | Get 100 free queries | WhoisXML API

Domain availability via API calls

Instantly know which domains can be purchased. This product is ideal for companies looking to expand their online portfolios or domainers seeking the most lucrative investments.

Get started

100 free credits. No credit card required.

774 Million+Domains tracked
21.0 Billion+WHOIS records
7,596+TLDs and ccTLDs tracked
52,000+Satisfied customers


  • Checks domain availability for registration.

  • Obtain results in the format of your choice—Extensible Markup Language (XML) or JavaScript Object Notation (JSON).

  • This API works for nearly all top-level domains (TLDs).

  • A connection to a WHOIS database that is updated daily ensures that you get the latest information.

Practical usage

Domain name research

Domain name research

Registrars and domainers use our tool to find out if domains are available for registration.

SEO optimization

Check the availability of recently expired domains, which have some traffic on them.

SEO optimization
Domain Availability API | WhoisXML API

Get 100 free API credits. No credit card required.

Get started

Premium API Services

Our APIs are available in an enhanced version that offers better performance with a dedicated load balancer and a premium endpoint to enable faster throttling for large-scale API deployments.

Learn more

Enterprise API Packages

Domain Availability API is part of an extensive set of domain and IP intelligence APIs. Integrate our capabilities into your platforms and systems to get relevant, precise, and near-real-time results.

Learn more