子网掩码对照表
0:0.0.0.0:4294967294
1:128.0.0.0:2147483646
2:192.0.0.0:1073741822
3:224.0.0.0:536870910
4:240.0.0.0:268435454
5:248.0.0.0:134217726
6:252.0.0.0:67108862
7:254.0.0.0:33554430
8:255.0.0.0:16777216
9:255.128.0.0:8388606
10:255.192.0.0:4194302
11:255.224.0.0:2097150
12:255.240.0.0:1048574
13:255.248.0.0:524286
14:255.252.0.0:262142
15:255.254.0.0:131070
16:255.255.0.0:65536
17:255.255.128.0:32766
18:255.255.192.0:16382
19:255.255.224.0:8190
20:255.255.240.0:4094
21:255.255.248.0:2046
22:255.255.252.0:1022
23:255.255.254.0:510
24:255.255.255.0:254
25:255.255.255.128:126
26:255.255.255.192:62
27:255.255.255.224:30
28:255.255.255.240:14
29:255.255.255.248:6
30:255.255.255.252:2
31:255.255.255.254:0
32:255.255.255.255:0
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