unless it has changed or varies by datacenter, DO issues a /124 by default -- I've confirmed this on my own droplets just now. issuing a /64 is "proper" because it is RFC[1].
Super late reply, but I just wanted to correct myself. I don't have a /64 on DO. I was confusing my DO config with something else. I'm sorry about that. You are correct.
unless it has changed or varies by datacenter, DO issues a /124 by default -- I've confirmed this on my own droplets just now. issuing a /64 is "proper" because it is RFC[1].
1. https://tools.ietf.org/html/rfc3177