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Whoisology - Connected database of whois records and whois history
Domainling - Domain search engine
WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Lean Domain Search - Find a Great Domain Name w/ twitter handle availability
WebCargo - Optimize your workflow by offloading it to us. Useful API's with seamless integration that scale to your needs.