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WhoisXML Domain Availability REST API v2.0

The Whois XML Domain Availability API allows users to check whether a domain name is available for registration. It has a coverage of 6.0+ billion WHOIS records and close to 600 million domains tracked across 2.864+ TLDs. Query results are available in both parsed fields and raw text in XML & JSON format. WHOIS data is updated in near real-time.