The original draft of draft-ietf-acme-ip contained a description of how to use the "dns-01" challenge for IPs, using the reverse DNS zone, but opposition to it was brought up at the IETF meeting in 2018, due to the perception of management issues with the zone, and unwillingness to use it for security purposes (see https://mailarchive.ietf.org/arch/msg/acme/7IP6kVYW6djmrammp19D_kRVUTg/ for some discussion of the arguments.) Since there was little appetite for it at the time, the mechanism was removed from the draft.
Additionally I wrote a very early draft of a CAA mechanism for IPs ( https://datatracker.ietf.org/doc/draft-shoemaker-caa-ip/), but since we removed the reverse DNS method from draft-ietf-acme-ip, I abandoned the work. - Roland
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