ip对应网关

CIDR Netmask IP Addresses
/13         255.248.0.0         524288
/14         255.252.0.0         262144
/15 255.254.0.0         131072
/16 255.255.0.0         65536
/17 255.255.128.0     32768
/18 255.255.192.0       16384
/19 255.255.224.0       8192
/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
/31 255.255.255.254                2
/32 255.255.255.255                1

可用ip数，为(IP Addresses－3)

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