表 1. 子网掩码的十进制等效值
128 64 32 16 8 4 2 1
十进制
1 0 0 0 0 0 0 0
128
1 1 0 0 0 0 0 0
192
1 1 1 0 0 0 0 0
224
1 1 1 1 0 0 0 0
240
1 1 1 1 1 0 0 0
248
1 1 1 1 1 1 0 0
252
1 1 1 1 1 1 1 0
254
1 1 1 1 1 1 1 1
255
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