2 ms·

They could also just do a reverse DNS lookup on the IP (and then forward lookup to confirm it). This would be less effective for sites run through CDNs (ex Clo

They could also just do a reverse DNS lookup on the IP (and then forward lookup to confirm it). This would be less effective for sites run through CDNs (ex Cloudflare) though.

sneak 5y ago
You just described almost all major API endpoints. Using PTRs is practically useless for this purpose.