IPv4掩码的算法

192.168.0.0/24

11111111.11111111.11111111.00000000
255.255.255.0
192.168.0.0 — 192.168.0.255

1.0.0.0/14
11111111.11111100.00000000.00000000
255.252.0.0
1.0.0.0 — 1.3.255.255

127.0.0.0/16
11111111.11111111.00000000.00000000
255.255.0.0
127.0.0.0 — 127.0.255.255

192.168.0.1/31
11111111.11111111.11111111.11111110
255.255.255.254
192.168.0.1/192.168.0.2