WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.
Whats My DNS - Instantly check your domain names current IP address and DNS record information against multiple name servers located in different parts of the world.
WebCargo - Optimize your workflow by offloading it to us. Useful API's with seamless integration that scale to your needs.
ViewDNS.info - Free DNS related tools including Reverse IP Lookup, DNS Propagation Checker, Chinese Firewall Test...
Bulk Whois API - Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, top notch support, and more.
CubDomain - CubDomain.com is the site to check website's statistics, Information, Whois Record, Hosting...