6个不能平分,用平分的方式分为8个,取其中6个。
172.10.0.0/19 172.16.0.0-172.16.31.254
172.10.32.0/19 172.16.32.1-172.16.63.254
172.10.64.0/19 172.16.64.1-172.16.95.254
172.10.96.0/19 172.16.96.1-172.16.127.254
172.10.128.0/19 172.16.128.1-172.16.159.254
172.10.160.0/19 172.16.160.1-172.16.191.254
172.10.192.0/19 172.16.192.1-172.16.223.254
172.10.224.0/19 172.16.224.1-172.16.255.254