Find out if a domain name is available
to be registered

Availability check Result Domain name

Domain Availability API is the most accurate domain availability checker offered on the market. The first 500 domain name availability lookups are complimentary when you register for a free developer account.

7.0+ billion WHOIS records
582+ million Domains tracked
2,864+ TLDs tracking
10+ years of data crawling


  • Checks domain availability for registration.
  • Query results, with both parsed fields and raw texts, are returned in popular XML & JSON format.
  • API works for nearly all of the TLDs.
  • Real-time Whois data, ensuring that only the most up to date and accurate information is delivered.

Practical uses

Domain names monitoring

Registrars and Domainers use tour tool to find out if domains are available.

SEO optimization

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

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.

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