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high-order bit
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The type of an IPv6 address is identified by the high-order bits of
the address, as follows:
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... the IPv6 address 4037::01:800:200E:8C6C is FF02::1:FF0E:8C6C. IPv6
addresses that differ only in the high-order bits (e.g., due to
multiple high-order prefixes associated with different aggregations ...