> Then I can allocate addresses out of the /64 to my own instances. I think that would call for a /48† if you're going to split it farther. Handing out /64 per

> Then I can allocate addresses out of the /64 to my own instances. I think that would call for a /48† if you're going to split it farther. Handing out /64 per server regardless of how many servers a client has seems just easier to me. One thing they could do due to virtually unlimited number of addresses is to let you keep them (instead of reusing for other customers) even if the servers are offline. You could create servers with IPs known in advance that way. Which actually makes it even more convenient to reserve /48† per customer and then carve out /64 per server. So maybe that's a better route. † or /56 but I don't know if the savings are worth the potential hassle.