Whoisology, offered by Domain Agents, is a free whois tool. Whoisology is a general interest / research tool that is based on whois data. You search whois records using any field you want such as name, email, address, phone number, registrar and nameservers.
Per their own disclaimer “Not all domain extensions are included and not all included extensions are completely indexed.”.
Live now on the site are archived whois records from the previous update and they are adding three more archives to their database that will go back more than a year. As they go forward, every quarter they will be archiving the live database. Giving you more and more data to dig into.
What you will soon have access to is a quarterly snapshot of domain name ownership records that are stitched together and searchable within a specific time frame or across the entire archive. Finding connections between domains, past and present, will be easier than ever.
They will also be adding features that let you compare search results, so you can see what names have been added or deleted by the associated email, name, address, phone number, and more.
What features would you like to see on Whoisology? Let them know how you’re using the site and what could make it better.