At 17:23 +0200 10/15/10, thoma spolnik wrote:

>That's fine. So I hope to find an answer. Must an _public_ IP address have

>a PTR or not?

The short answer is no.

To give you an idea of how much debatehas occurred over that question, that question was considered inside the IETF (the de facto Internet engineering standards body) for over 5 years and there was no positive or really definitive outcome.

In 2000 this proposal was submitted http://tools.ietf.org/html/draft-senie-inaddr-required-00 and was revised over the period of 5 years to be this proposal (within one of the official working groups) http://tools.ietf.org/html/draft-ietf-dnsop-inaddr-required-07).  Still, no RFC emerged from all this (meaning it failed to pass all of the review cycles).

You may notice the title changed from :

Requiring DNS IN-ADDR Mapping

to

Encouraging the use of DNS IN-ADDR Mapping

and even that wasn't agreed upon.

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