> So we need 2*10^12 subnets just for currently foreseeable uses. Or in terms
> of address space, consumption of 41 bits. If we leave out the 3 bit format
> prefix, this leaves us with 20 bits to waste (if subnets are /64). If the
> default subnet is /48, we only have 4 bits to waste. And that's not much.

Point 1: Subnets (under format prefix 001 binary) *are* 64 bits, not
48.  That is not under any sort of argument by anyone, as far as I
know.  The question the registries are trying to open is how many
subnets get assigned in a block to a "site".

Point 2: You've already built in a 90% "waste" into your numbers, so
saying that you are left with "only n bits to waste" is pure deception.

                                        Matt Crawford
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