If it's for a business, I would contact them to see if they have a commercial offering, but I think the Hurricane Electric Free DNS might actually fit.
No. Cloudflare will give a key scoped to an entire administrative domain in the Cloudflare sense like “a.com”. They will not give you a key scoped to a single entry within that domain. (That entry would be a domain in the RFC 9499 sense, but do you really expect anyone to agree on the terminology?)
In particular, there is no support for getting a key scoped to _acme-challenge.a.b.c or, even better, to a particular RR.
Maybe if you have an enterprise plan you can very awkwardly fudge it using lots of CNAMEs and subdomains.
Some DNS hosts that support old-school dynamic dns can do this. dns.he.net is an example, but they have a login system that very much stuck in the nineties.
If it's for a business, I would contact them to see if they have a commercial offering, but I think the Hurricane Electric Free DNS might actually fit.
https://dns.he.net/
Interestingly, HE’s commercial offerings are in some respects excellent, but their login system is every bit as primitive as the free stuff.
Might be obvious, but Cloudflare
No. Cloudflare will give a key scoped to an entire administrative domain in the Cloudflare sense like “a.com”. They will not give you a key scoped to a single entry within that domain. (That entry would be a domain in the RFC 9499 sense, but do you really expect anyone to agree on the terminology?)
In particular, there is no support for getting a key scoped to _acme-challenge.a.b.c or, even better, to a particular RR.
Maybe if you have an enterprise plan you can very awkwardly fudge it using lots of CNAMEs and subdomains.
Some DNS hosts that support old-school dynamic dns can do this. dns.he.net is an example, but they have a login system that very much stuck in the nineties.
Cloudflare DNS isn't fully functional (at least for me). Can't be used for general purpose DNS hosting imho.
Hetzner DNS