Stop thinking about 64 bits as an address space that might get filled (like it did in IPv4). The 128 bit length of IPv6 allows them to be used differently - mor

Stop thinking about 64 bits as an address space that might get filled (like it did in IPv4). The 128 bit length of IPv6 allows them to be used differently - more like a UUID that can be randomly generated with low probability of collision (similar to Git hashes). This allows a number of features like self-assigning random IP addresses on private networks that would be infeasible with a smaller address space.