On 2023-03-25 08:32, Greg Wooledge wrote:
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.)
Thanks Greg.
I also don't know .one is a valid TLD, looks surprising.
But, one.one is owned by a domain registrar (one.com), while
one.one.one's zone owner is cloudflare.
$ dig one.one soa +short
a.b-one-dns.net. hostmaster.one.com. 2013010101 1800 900 1209600 300
$ dig one.one.one soa +short
fred.ns.cloudflare.com. dns.cloudflare.com. 2305085481 10000 2400 604800
3600
maybe they co-work for this domain.
regards.
