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230问答网 > 若要将一个B类的网络172.16.0.0，划分为14个子网，请计算出每个子网的子网掩码，以及在每个子网中主机IP地

若要将一个B类的网络172.16.0.0，划分为14个子网，请计算出每个子网的子网掩码，以及在每个子网中主机IP地

以及在每个子网中主机IP地址的范围是多少？

2024-12-16 20:02:30

推荐回答（3个）

回答1：

划分的子网个数是和子网掩码的借位成比例的。原来的主类网络掩码为16位。划分14个子网需要借的位数是：2的m次方>=14，m=4，即借4位。划分后每个子网的掩码均为20位。即255.255.240.0以下是每个子网的IP范围和有效主机IP范围。
172.16.0.0--172.16.15.255 有效主机的IP范围172.16.0.1---172.16.15.254
172.16.16.0--172.16.31.255 有效主机的IP范围172.16.16.1---172.16.31.254
172.16.32.0--172.16.47.255 有效主机的IP范围172.16.32.1---172.16.47.254
172.16.48.0--172.16.63.255 有效主机的IP范围172.16.48.1---172.16.63.254
172.16.64.0--172.16.79.255 有效主机的IP范围172.16.64.1---172.16.79.254
172.16.80.0--172.16.85.255 有效主机的IP范围172.16.80.1---172.16.85.254
172.16.86.0--172.16.111.255 有效主机的IP范围172.16.86.1---172.16.111.254
172.16.112.0--172.16.127.255 有效主机的IP范围172.16.112.1---172.16.127.254
172.16.128.0--172.16.143.255 有效主机的IP范围172.16.128.1---172.16.143.254
172.16.144.0--172.16.159.255 有效主机的IP范围172.16.143.1---172.16.159.254
172.16.160.0--172.16.175.255 有效主机的IP范围172.16.160.1---172.16.175.254
172.16.176.0--172.16.191.255 有效主机的IP范围172.16.176.1---172.16.191.254
172.16.192.0--172.16.207.255 有效主机的IP范围172.16.192.1---172.16.207.254
172.16.208.0--172.16.223.255 有效主机的IP范围172.16.208.1---172.16.223.254

回答2：

172.16.0.0/20

回答3：

255.255.128.0:/17
255.255.192.0:/18
255.255.224.0:/19
255.255.240.0:/20
255.255.248.0:/21
255.255.252.0:/22
255.255.254.0:/23
255.255.255.0:/24
255.255.255.128:/25
255.255.255.192:/26
255.255.255.224:/27
255.255.255.240:/28
255.255.255.248:/29
255.255.255.252:/30

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