Hey Kevin,

This is not an issue at all.
A PTR is different then a "A" record and can be used by two reverse domain names and only the owner of the IP addresses space can define them. I am not sure if two PTR records for two domains will be applied to one IP but it is possible for two IP addresses to have the same PTR.

Can we even use a CNAME as a PTR???

Eliezer

On 09/11/2014 12:37 AM, Kevin Darcy wrote:
Also, have you considered the forward/reverse ambiguity that arises when
multiple owner names resolve to the same address? To which of those
names does the PTR point?

     - Kevin

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