In reality it is more complex as the address space is split in two, the bottom 64 bits rarely has any density, only a few devices. End users get a /64 or a /48 (or a few); a VPS will probably get a /64 by default.
Well that is reassuring. For a second there I thought I read that "3% of the address space was used up" but I knew that couldn't be true. I remember learning about IPV4 back in Computer Science class and having to learn subnets and everything. This seems way more confusing!
In reality it is more complex as the address space is split in two, the bottom 64 bits rarely has any density, only a few devices. End users get a /64 or a /48 (or a few); a VPS will probably get a /64 by default.