C类IP划分3个子网

A子网:192.168.80.0~192.168.80.63
B子网:192.168.80.64~192.168.80.127
C子网:192.168.80.128~192.168.80.191
备用子网:192.168.80.192~192.168.80.255
我只是把80网段划分成4个网段，每个网段和二楼所说的只有62个可以用地址，至于要把哪个网段划分成A、B、C