参考:IPv6アドレス体系 (FP 3bit + TLA 13bit + Sub-TLA 13bit + NLA 19bit + SLA 16 bit = 64 bit) +---+---------------------+-----------+----------------------------+ | 3 | 45 bits | 16 bits | 64 bits | +---+---------------------+-----------+----------------------------+ |001|global routing prefix| subnet ID | interface ID | +---+---------------------+-----------+----------------------------+ RFC3587より