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文章标签 ‘ipv4’

IPv4网络掩码对照表

2012年7月21日 没有评论
序号 子网掩码 CIDR 总IP数 可用IP数 C网子网数
1 255.255.255.255 /32 1 1 1/256
2 255.255.255.254 /31 2 0 1/128
3 255.255.255.252 /30 4 2 1/64
4 255.255.255.248 /29 8 6 1/32
5 255.255.255.240 /28 16 14 1/16
6 255.255.255.224 /27 32 30 1/8
7 255.255.255.192 /26 64 62 1/4
8 255.255.255.128 /25 128 126 1/2
9 255.255.255.0 /24 256 254 1
10 255.255.254.0 /23 512 510 2
11 255.255.252.0 /22 1024 1022 4
12 255.255.248.0 /21 2048 2046 8
13 255.255.240.0 /20 4096 4094 16
14 255.255.224.0 /19 8192 8190 32
15 255.255.192.0 /18 16,384 16,382 64
16 255.255.128.0 /17 32,768 32,766 128
17 255.255.0.0 /16 65,536 65,534 256
18 255.254.0.0 /15 131,072 131,070 512
19 255.252.0.0 /14 262,144 262,142 1024
20 255.248.0.0 /13 524,288 524,286 2048
21 255.240.0.0 /12 1,048,576 1,048,574 4096
22 255.224.0.0 /11 2,097,152 2,097,150 8192
23 255.192.0.0 /10 4,194,304 4,194,302 16,384
24 255.128.0.0 /9 8,388,608 8,388,606 32,768
25 255.0.0.0 /8 16,777,216 16,777,214 65,536
26 254.0.0.0 /7 33,554,432 33,554,430 131,072
27 252.0.0.0 /6 67,108,864 67,108,862 262,144
28 248.0.0.0 /5 134,217,728 134,217,726 1,048,576
29 240.0.0.0 /4 268,435,456 268,435,454 2,097,152
30 224.0.0.0 /3 536,870,912 536,870,910 4,194,304
31 192.0.0.0 /2 1,073,741,824 1,073,741,822 8,388,608
32 128.0.0.0 /1 2,147,483,648 2,147,483,646 16,777,216
33 0.0.0.0 /0 4,294,967,296 4,294,967,294 33,554,432
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