On Sat, Mar 25, 2023 at 08:28:03AM +0800, f...@dnsbed.com wrote: > Greetings, > > as you see this PTR, > > $ dig -x 1.1.1.1 +short > one.one.one.one. > > so 2.2.2.2 can have the PTR two.two.two.two? and 3.3.3.3 can have > three.three.three.three?
Any IP address can have any PTR value. You just have to petition the owner of the IP address range to set it. I didn't know .one was a valid TLD. It looks like .two is not, so if someone were to assign "two.two.two.two" as the PTR value of an IP address, that PTR would not resolve back to any IP address. (An IP address block owner might reject such a petition.)
