ASN Domain for rDNS

Rubens Kuhl rubensk at
Wed Dec 10 11:20:45 UTC 2014

And considering browsers use domains to define whether to send cookies or
not along a request, not having access customers on the same domain of your
website is a security benefit.


On Wed, Dec 10, 2014 at 3:13 AM, Kate Gerry <kate at> wrote:

> Short answer: I just like doing it.
> Long answer: It allows me to create as many hosts on a segregated domain
> instead of making my company DNS zone 3000 records long.
> -----Original Message-----
> From: NANOG [mailto:nanog-bounces at] On Behalf Of Fred
> Sent: Tuesday, December 09, 2014 4:36 PM
> To: nanog at
> Subject: Re: ASN Domain for rDNS
> I'd say this is mostly for whitelabelling reason rather than a technical
> one?
> Keefe John:
> > I've been seeing more and more carriers(and even small ISPs) using
> > as their domain for rDNS on IP space.  What are the pros
> > and cons for doing this versus using your primary business domain name?
> >
> > Keefe John

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