Ran into this issue last month. We manage our DNS externally and are locked into that for a while unfortunately. We tried to brand our CDN by adding a subdomain to DO but it wouldn't let us add it to a CDN. A way to point a subdomain to DO and use it for a CDN would be immensely helpful.

I'm in need of this as well. Technically, it should be completely possible to do since automated ACME DNS challenges can be done on subdomains as well.

As a solution in the interim, one could use the "Bring your own certificate" functionality and use the DigitalOcean API (https://developers.digitalocean.com/documentation/v2/#certificates) to automate the refreshing of certificates that way.

Hi Richard, I'm not sure what's not technically possible about pointing a subdomain to spaces. You can point a subdomain to any IP address.

To my knowledge, that's not technically possible as sub.example.com ISN'T a domain.