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:
- viewdns.info/reverseip/?host=66.175.106.158&t=1 has a hit from 2011
- dns-history.whoisxmlapi.com/api is empty
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