[dns-operations] question about a host

[Frank Louwers]

Hi Eliza,

This “trick” works because .one is a valid TLD (belongs to one.com). So “one.one.one.one” is a valid DNS name. I assume the CF folks asked nicely and One.com set up the record.

Kind Regards,

Frank Louwers
Certified PowerDNS Consultant @ kiwazo.be



> On 14 Aug 2019, at 11:47, Eliza <eli at chinabuckets.com> wrote:
> 
> Hi,
> 
> I found 1.1.1.1's PTR has a interesting host:
> 
> $ dig -x 1.1.1.1 +short
> one.one.one.one.
> 
> Then I query this host:
> 
> $ dig one.one.one.one. +short
> 1.1.1.1
> 
> It can be resolved. why this trick works?
> but two.two.two.two gets wrong...
> 
> thanks.
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