通过子网掩码255.255.224.0，表主机号224，可算出共划分了32个子网。
每个子网的网络地址如下:
129.250.0.0
129.250.8.0
129.250.16.0
129.250.24.0
129.250.32.0
129.250.40.0
129.250.48.0
129.250.56.0
129.250.64.0
129.250.72.0
129.250.80.0
129.250.88.0
129.250.96.0
129.250.104.0
129.250.112.0
129.250.120.0
129.250.128.0
129.250.136.0
129.250.144.0
129.250.152.0
129.250.160.0
129.250.168.0
129.250.176.0
129.250.184.0
129.250.192.0
129.250.200.0
129.250.208.0
129.250.216.0
129.250.224.0
129.250.232.0
129.250.240.0
129.250.248.0
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