It would be awesome if Netlify DNS implemented dynamic ddns functionality. There is something that implements it from the client side: https://github.com/oscartbeaumont/netlify-dynamic-dns but support for RFC 2136 from Netlify would be nice
Thanks for the suggestion, @zowpowow! Just got a feature request filed for us and will follow up in this thread in case we later implement it.
I don’t anticipate it will ship anytime soon, if at all, so for now the repo you linked shows your best pattern (using the API) to implement it for yourself.