After dealing for so many years with the very small IPv4 address space, the enormous number of addresses in IPv6 must have made the IETF engineers feel like kids in a candy shop. They were good kids, however, and didn't run wild grabbing all the candy they could find and gobbling it up. They very carefully considered how to divide the address space for various uses. Of course, when you have this much candy, sharing becomes pretty easy.
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