Ponderworthy's Whois is described as 'A simple, reliable, and fast lookup, of the whois database systems, for Internet domains'. There are more than 25 alternatives to Ponderworthy's Whois, not only websites but also apps for a variety of platforms, including Windows, Linux, Mac and Self-Hosted solutions. The best alternative is DomainTools, which is free. Other great sites and apps similar to Ponderworthy's Whois are WebCargo (Paid), JsonWhois.io (Freemium), ViewDNS.info (Free Personal) and Robtex Swiss Army Knife Internet Tool (Free).
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.
Online-Domain-Tools.com makes your online life easier and happier. Various domain tools, network tools, web and browser tools, security and privacy tools, data and conversion tools, and coders tools are ready to be used immediately.