EUI-64 IPv6 addresses are generated from MAC addresses by taking the network prefix (64 bits) and appending the first half of the MAC address, then
FF:FE, then the second half of the MAC. Is there a reason for the
FF:FE? Other than 64+64=128.
Note: I didn't mention in the above that some bits in the prefix, specifically the "global" identifier and the "unique" identifier, get flipped.