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JsonWhois.io - JsonWhois is the leading cloud hosted Whois API.
EZwhois - Whois domain information such as registrar, domain status, expiration date, and name servers.
DomainTools - Domain name research, including comprehensive Whois Lookup, Reverse Whois Lookup and Whois History.
WebCargo - Optimize your workflow by offloading it to us. Useful API's with seamless integration that scale to your needs.
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...