某单位分配到一个b类ip地址,其网络标识为123.45.0.0.该单位有4000多台机器,平均分

123.45.0.0/20

IP地址起止123.45.0.1---123.45.15.254
123.45.16.0/20
IP地址起止123.45.16.1---123.45.31.254
123.45.32.0/20

IP地址起止123.45.32.1---123.45.47.254
123.45.48.0/20
IP地址起止123.45.48.1---123.45.63.254
123.45.64.0/20
IP地址起止123.45.64.1---123.45.79.254
123.45.80.0/20
IP地址起止123.45.80.1---123.45.95.254
123.45.96.0/20
IP地址起止123.45.96.1---123.45.111.254
123.45.112.0/20

IP地址起止123.45.112.1---123.45.127.254
123.45.128.0/20
IP地址起止123.45.128.1---123.45.143.254
123.45.144.0/20
IP地址起止123.45.144.1---123.45.159.254
123.45.160.0/20
IP地址起止123.45.160.1---123.45.175.254
123.45.176.0/20
IP地址起止123.45.176.1---123.45.191.254
一共12个IP地址段
望采纳