[dns-operations] Trustworthiness of PTR record targets

Glen Wiley glen.wiley at gmail.com
Tue Mar 4 10:23:34 UTC 2014

I have seen ISPs and hosting proividers reluctant to offer to add PTR
records for blocks that they control that point to hosts in domains out of
their control.  As a result you end up with either no PTR or a PTR that
points an IP to a host that isn't relevant or correct as far as what the
Internet sees on the host.

On Mon, Mar 3, 2014 at 12:26 PM, Stephen Malone <
Stephen.Malone at microsoft.com> wrote:

>  Hi Folks,
> For PTR records out there that are pointing to domains other than those
> that you control, I'm looking to understand common practice around their
> setup. Two questions:
> 1.       In general, can I trust PTR records? Is ownership of the target
> domain validated at setup time by ISPs, and if yes, how is this done?
> 2.       If ownership of PTR targets is not routinely validated, is there
> a risk that the target domain could be blacklisted by anti-spam providers?
> Thanks,
> Stephen Malone
> Microsoft
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Glen Wiley

"A designer knows he has achieved perfection not when there is nothing left
to add, but when there is nothing left to take away." - Antoine de
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