网络的子网掩码呢?
如果是255.255.0.0的话,划分为8个子网,没个子网的子网掩码为255.255.224.0
172.20.0.0 255.255.224.0 范围:172.20.0.0-172.20.31.255
172.20.32.0 255.255.224.0 范围:172.20.32.0-172.20.63.255
172.20.64.0 255.255.224.0 范围:172.20.64.0-172.20.95.255
172.20.96.0 255.255.224.0 范围:172.20.96.0-172.20.127.255
172.20.128.0 255.255.224.0 范围:172.128.0.0-172.20.159.255
172.20.160.0 255.255.224.0 范围:172.20.160.0-172.20.191.255
172.20.192.0 255.255.224.0 范围:172.20.192.0-172.20.223.255
172.20.224.0 255.255.224.0 范围:172.20.224.0-172.20.255.255
其中每个网段的第一个地址和最后一个地址分别为网段地址和广播地址,不可以做为主机地址使用
您要划分的IP地址是:172.020.000.000 是 B 类IP地址
您要划分的子网数量是 8 个,子网掩码是:255.255.255.0 254
每段子网的网络号是TO前IP的最后一位减1
每段子网的广播地址是TO后IP最后一位加1
1>172.020.0.1TO172.020.9.254
2>172.020.10.1TO172.020.19.254
3>172.020.20.1TO172.020.29.254
4>172.020.30.1TO172.020.39.254
5>172.020.40.1TO172.020.49.254
6>172.020.50.1TO172.020.59.254
7>172.020.60.1TO172.020.69.254
8>172.020.70.1TO172.020.79.254