求教批处理整理文本内容按IP的C段排列

29943270

文本内容如下：

125.120.138.221
125.120.138.222
125.120.147.162
125.120.147.163
125.120.147.164
125.120.147.165
125.120.147.166
125.120.146.167
125.120.146.168
125.120.146.169
125.120.146.170
125.120.146.171
125.120.146.172
60.118.192.130
60.118.192.131
60.118.192.132
60.118.192.133
60.118.192.134
60.118.192.135
60.118.192.136
60.118.192.137
111.187.153.16
111.187.153.17
111.187.153.18
111.187.153.19
111.187.153.20
111.187.153.21
111.187.153.22
111.187.153.23



想用批处理  排序，每个ip的C段，取1个来排序，所有的ip的C网都取一个来排列，例如像得到结果如下

125.120.138.221
125.120.147.162
125.120.146.167
60.118.192.130
111.187.153.16
125.120.138.222
25.120.147.163
125.120.146.168
60.118.192.131
111.187.153.17


应该怎么写这个批处理，求教

sxw

什么叫 C 段？