4 ms·

It's forward confirming reverse DNS. I assumed that everyone does that by default.

• petee 2y ago
  What everyone does by default doesn't matter really here, it's that an IP owner/user can literally set the reverse to any arbitrary domain regardless if the actual domain has a record for that IP. What matters is both match, thats all I meant
  • nalllar 2y ago
    xena said "forward confirming reverse" twice which means rdns and then resolving that forward to confirm it matches.
    • petee 2y ago
      I don't know if it was edited or I missed it in the first post but you're right. I'd still be surprised if an Amazon domain resolved to a residential IP