ICANN WHOIS is described as 'ICANN (Internet Corporation for Assigned Names and Numbers) WHOIS search lets you lookup any generic domain to find out the registered domain owner and related information'. There are more than 25 alternatives to ICANN WHOIS, not only websites but also apps for a variety of platforms, including Windows, Linux, Self-Hosted solutions and Mac. The best alternative is WebCargo. It's not free, so if you're looking for a free alternative, you could try JsonWhois.io or WhoisAPI. Other great sites and apps similar to ICANN WHOIS are Domain Checker (Freemium), Whois (Free), EZwhois (Free) and Whoisology (Freemium).
JsonWhois is the leading cloud hosted Whois API. The service serves WHOIS records for domains and IP addresses through a fully RESTful API. Additionally, the service offers IP geolocation and URL to screenshot services. Free usage per month!.
WhoisAPI is the premier provider of freshly parsed whois data for domain names and IP addresses, also providing IP to geolocation, HTML to PDF, and domain availability RESTful HTTP APIs. Billing is performed on a pay as you go basis, free monthly use.
Obtain domain name status information with this effective and intuitive application that allows you to batch process multiple entries. Domain Checker is a simple, but powerful whois lookup tool for users that require a domain availability analyzer.
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Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, and top notch support. We support all TLDs including new gTLDs as well as IP addresses. Spend no more than necessary to get WHOIS data for your business.