子网掩码主要用于确定IP地址中的网络号和主机号以及将一个大的IP网络划分为若干个小的子网络。
Subnet mask is mainly used to define the network number, host number of IP address and divide one heavy IP network into several subnets.
子网掩码由四个字节组成，它的值为255时表示IP地址中网络地址的部分，值为0时则识别IP地址中表示主机号的部分。
The subnet mask is an octet that USES the number 255 to represent the network address portion of the IP address and a zero to identify the host portion of the address.
在实际环境中，还需要使用其他一些路由信息将特定序列号关联到不同的主机。
In a real environment, additional routing information would be required to associate specific serial Numbers with different hosts.
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