hweily

CIDR區塊表示法 等於幾個Class C 可能的主機數量
/24                            1                    254
/23                            2                    512
/22                            4                    1022
/21                            8                    2046
/20                            16                  4094
/19                            32                  8190
/18                            64                  16,382
/17                            128                32,766
/16                            256                65,534
/15                            512                131,070
/14                            1024              262,142
/13                            2048              542,486