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dns-history.whoisxmlapi.com/api
They do have historic reverse IP search at dns-history.whoisxmlapi.com/api but their data is not obviously more complete than viewdns.info, e.g.: as of March 2025:Their whois data seems much better quality however.
As of 2025, you can do historical whois for free on the API demo under whois-history.whoisxmlapi.com/ but it only shows the 3 newest records.
To unlock that, you have to create an account, which gives you 500 credits, and then:
They do normalize Gmail dot trick, but not for the googlemail trick.

Ancestors (10)

  1. DNS database
  2. Domain Name System
  3. Internet protocol suite
  4. Internet
  5. Computer network
  6. Computer
  7. Information technology
  8. Area of technology
  9. Technology
  10. Home