Table19.1IPv4分类寻址块的个数与每块的长度 Class Number of Blocks Block Size Application A 128 16,777.216 Unicast B 16,384 65,536 Unicast 0 2,097,152 256 Unicast D 1 268,435.456 Multicast E 1 268.435.456 Reserved 19.1019.10 Table 19.1 IPv4分类寻址块的个数与每块的长度