This is a case of "everything you know is wrong", because there are
fundamental differences between IPV4 and IPV6. In short, *** IPV6
DOES NOT HAVE ANYTHING EQUIVALANT TO IPV4's 127.0.0.0/8 address range
***.
It doesn't need to. The A records returned by DNSLs are not machine
addresses; there is no reason not to use the full 32 bits available,
except human discomfort with treating A records that way.
Don't assume that you can play fast and loose with 16 million
addresses in the range ::0 to ::FF:FF:FF:FF.
::0 through ::FF:FF:FF:FF is ff00ff00ff0100 hex, or 71777214294589696
decimal, addresses, not anything like 16 million. If you mean 16777216
addresses, ITYPM ::0 through ::ff:ffff.
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