Net bits
Subnet mask total-addresses
/20 255.255.240.0 4096
/21 255.255.248.0 2048
/22 255.255.252.0 1024
/23 255.255.254.0 512
/24 255.255.255.0 256
/25 255.255.255.128 128
/26 255.255.255.192 64
/27 255.255.255.224 32
/28 255.255.255.240 16
/29 255.255.255.248 8
/30 255.255.255.252 4
Net Mask 二進位表示法 可分幾個 Network
255.255.255.0 11111111.11111111.11111111.00000000 1
255.255.255.128 11111111.11111111.11111111.10000000 2
255.255.255.192 11111111.11111111.11111111.11000000 4
255.255.255.224 11111111.11111111.11111111.11100000 8
255.255.255.240 11111111.11111111.11111111.11110000 16
255.255.255.248 11111111.11111111.11111111.11111000 32
255.255.255.252 11111111.11111111.11111111.11111100 64

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