与运算规则:11为1,10、00、01均为0
11000000 10101000 00000000 01000101 192.168.0.69
11111111 11111111 11111111 00000000 255.255.255.0
11000000 10101000 00000000 00000000
11000000 10101000 00000000 01001111 192.168.0.79
11111111 11111111 11111110 00000000 255.255.254.0
11000000 10101000 00000000 00000000
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