comcast ipv6 PTR

Tue Oct 15 03:18:15 UTC 2013

On Mon, Oct 14, 2013 at 10:01 PM, Barry Shein <bzs at world.std.com> wrote:

> >This would be a lot of work, so nobody does it.
> >If someone asks for the rdns for:
>   >  2001:0db8:85a3:0042:1000:8a2e:0370:7334
> >it's a lot of work for example.com to return something like:
> >   2001-0db8-85a3-0042-1000-8a2e-0370-7334.example.com
> >?
>
>
No... it's not a lot of work;   the problem is,  it's maybe worth  even
less than the amount of work involved though.

What piece of information is being expressed there that would not be
 expressed by a NXDOMAIN response?

Assuming the user is residential  ".example.com"   pertains to the ISP,
 not the hostname at that IP address. The ISP's info    is accessible via
services such as WHOIS-RWS

How about some  wildcard PTR record ?

*.3.a.5.8.8.b.d.0.1.0.0.2.ip6.arpa     PTR     unnamedhost.example.com.

 It's equally useless; and conveys equally limited information about the
host.

However, at least it doesn't generate spurious records  that are just  (IP
repeated).(domain)

-- 
-JH