Passive DNS reconstruction is a real thing. I wouldn't test out a web site on its own FQDN and expect it to stay unnoticed; just sayin'.
Just because the PTRs are garbage doesn't mean that Amazon, Fastly, Cloudflare don't have the data. Nuggets of truth are scattered in other comments. The GitHub tool is a political statement in and of itself.
Passive DNS reconstruction is a real thing. I wouldn't test out a web site on its own FQDN and expect it to stay unnoticed; just sayin'.
Just because the PTRs are garbage doesn't mean that Amazon, Fastly, Cloudflare don't have the data. Nuggets of truth are scattered in other comments. The GitHub tool is a political statement in and of itself.