WhoisThisDomain - Domain name lookup tool that allows you to get information about domain registration from WHOIS server.

Mrdomain - Mrdomain is one of the leading hosting sites that provides you an opportunity to create your own website or online store in no time and without any hidden cost.

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.

Combell - Combell offers professional web hosting, cloud hosting and servers for Linux and Windows.

Whoisology - Connected database of whois records and whois history

Instra - Instra is a rich-featured website that provides one of the best leading registration services of domain names and convergence technologies.