There are 128 bits for more flexible subnetting, not for 2^128 devices. There is even recommendation to not assign less than /48 for single site. (and absolutel

There are 128 bits for more flexible subnetting, not for 2^128 devices. There is even recommendation to not assign less than /48 for single site. (and absolutely not less than /64, because SLAAC won't work)