ip地址掩码和位数对应关系表、子网掩码、网络地址、主机地址
ip地址位数表
掩码位数可用主机数（主机地址数）255.0.0.0816777216-2=16777214255.128.0.098388608-2=8388606255.192.0.0104194304-2=4194302255.224.0.0112097152-2=2097150255.240.0.0121048576-2=1048574255.248.0.013524288-2=524286255.252.0.014262143=262142255.254.0.015131072-2=131070255.255.0.01665536-2=65534255.255.128.01732768-2=32766255.255.192.01816384-2=16382255.255.224.0198192-2=8190255.255.240.0204096-2=4094255.255.248.0212048-2=2046255.255.252.0221024-2=1022255.255.254.023511=510255.255.255.024256-2=254255.255.255.12825128-2=126255.255.255.1922664-2=62255.255.255.2242731=30255.255.255.2402816-2=14255.255.255.248298-2=6255.255.255.252304-2=2
文档来源：51CTO技术博客https://blog.51cto.com/luciferliu/3029171
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