掩码位、正掩码、反掩码对照表

掩码位 正掩码 反掩码
1 128.0.0.0 127.255.255.255
2 192.0.0.0 63.255.255.255
3 224.0.0.0 31.255.255.255
4 240.0.0.0 15.255.255.255
5 248.0.0.0 7.255.255.255
6 252.0.0.0 3.255.255.255
7 254.0.0.0 1.255.255.255
8 255.0.0.0 0.255.255.255
9 255.128.0.0 0.127.255.255
10 255.192.0.0 0.63.255.255
11 255.224.0.0 0.31.255.255
12 255.240.0.0 0.15.255.255
13 255.248.0.0 0.7.255.255
14 255.252.0.0 0.3.255.255
15 255.254.0.0 0.1.255.255
16 255.255.0.0 0.0.255.255
17 255.255.128.0 0.0.127.255
18 255.255.192.0 0.0.63.255
19 255.255.224.0 0.0.31.255
20 255.255.240.0 0.0.15.255
21 255.255.248.0 0.0.7.255
22 255.255.252.0 0.0.3.255
23 255.255.254.0 0.0.1.255
24 255.255.255.0 0.0.0.255
25 255.255.255.128 0.0.0.127
26 255.255.255.192 0.0.0.63
27 255.255.255.224 0.0.0.31
28 255.255.255.240 0.0.0.15
29 255.255.255.248 0.0.0.7
30 255.255.255.252 0.0.0.3
31 255.255.255.254 0.0.0.1
32 255.255.255.255 0.0.0.0
posted @ 2025-07-17 10:19  liy36  阅读(275)  评论(0)    收藏  举报