alt Hacker NewsCopying and pasting was just my attempt to demonstrate how simple a v6 rDNS record is to add. If you were interested in hiring me to write a solution for your ISP, that's fine, but you can't seriously expect random people to do it for you for free in a HN comment.
It should be pretty obvious that a script can generate these records from the forward records or from any other source of IPs/hosts, with no per-address effort needed on the part of the network admins.
Again, absolutely blind to the management of these things at scale. Yeah, I don't rightly care about "how easy it is" to generate them. You can't even comprehend or convey the massive number of records and zones that are involved in managing a network of devices that all require dynamic updates to reverse-DNS and add/update/remove device addresses on a regular basis.
DNS is a distributed database system, and so the challenge is not cramming in data with a brainless script, but managing how that data is distributed and accessed by thousands or millions of peer servers, caches, and clients worldwide.
IPv4 reverse-DNS was quite simple when it was broken on octet boundaries and there were only four of those boundaries in total. But even then, ISPs could often not be arsed to put the right data in there. Some left it blank and some waited until they were forced, by strict requirements that said reverse must match forward DNS in many cases.
I have never found any user-accessible software, not on any Linux distribution or on any cloud service, that would permit an ordinary consumer to manage even a /24 IPv4 network's reverse-DNS at scale, or programmatically, as opposed to by-hand "copy paste" as has been so condescendingly suggested here. There are plenty of hosted DNS providers, and there are plenty of monkey-brain Dashboard interfaces where you can pound out one A record at a time. But there was nothing to deal with dynamic addressing or DNS databases at scale. That's why IPv6's reverse DNS remains an absurd non-solution.