Who-is.xyz is described as 'Check the whois record of any domain name to find domain names available to register cheap. A domain name whois & availability checker to help you succeed'. There are more than 10 alternatives to Who-is.xyz, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Android. 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 Who-is.xyz are EZwhois (Free), ICANN WHOIS (Free), WhoisThisDomain (Free) and SmartWhois (Paid).
DomainHostingView is a utility for Windows that collects extensive information about a domain by using a series of DNS and WHOIS queries, and generates HTML report that can be displayed in any Web browser.