A standard way of assigning the 64 host bits is to use the 48-bit MAC address of the host together with a fixed 8-bit FFFE code.

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This description refers to the creation of an EUI-64 format interface ID in IPv6, which involves using the 48-bit MAC address, inserting the 16-bit FFFE in the middle, and inverting the 7th bit of the original MAC address, not assigning 64 host bits directly.

A Standard Way of Assigning the 64 Host Bits Is