The Whois APIs return well-parsed whois fields in XML and JSON formats. The Whois APIs can be used to track domain registrations, check domain name availability, detect credit card fraud, locate users geographically. The Whois Domain Availability API returns information regarding the availability of specific domains. Whois offers 100 free lookups to test their API service before an account is required. Sample code exists that demonstrates how to access the Domain Availability API with PHP & Java code.