On Wednesday, 22 January 2020 13:14:35 UTC, Tim Watts wrote:

Does anyone know of any DNS *hosting* company that provides support for
arbitrary arpa zone hosting?

I've used Zonomi (http://www.zonomi.com) for many years now and can highly recommend them. Support for forward and reverse, and pretty much any feature you could imagine. For a single zone it'd be free.

Mathew