用来识别,IP地址中的网络地址和主机地址
https://blog.csdn.net/kongguguren/article/details/79427465?utm_medium=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase&depth_1-utm_source=distribute.pc_relevant_t0.none-task-blog-BlogCommendFromMachineLearnPai2-1.nonecase
本文标题:子网掩码
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