Re:Web Application Penetration Testing Cheat Sheet
by sbarre on Monday April 02, 2018 @07:53AM
(#16733795)
This seems like the most likely candidate then (a resolver that caches and shares requests or CT - which I didn't know about), because the subdomain is a random string of characters so it wouldn't have been brute-forced.
Thank you for the insights!
So probably CT logs.
Also, if you've ever sent a cold-cache query to a recursive resolver that didn't employ QNAME minimization (few do), it was likely harvested by pDNS replication at the TLD nameserver level and shared with a number of commercial and research parties' databases to which DNSDumpster may subscribe.