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2024年7月18日发(作者：)
子网掩码-掩码位-反掩码对比表
子网掩码 CIDR 主机数 可用主机数 C类网段数量
Subnet Mask CIDR Prefix Total IP's Usable IP's Number of Class C networks
255.255.255.255 /32
255.255.255.254 /31
255.255.255.252 /30
255.255.255.248 /29
255.255.255.240 /28
255.255.255.224 /27
255.255.255.192 /26
255.255.255.128 /25
255.255.255.0 /24
255.255.254.0 /23
255.255.252.0 /22
255.255.248.0 /21
255.255.240.0 /2
255.255.224.0 /19
255.255.192.0 /18
255.255.128.0 /17
255.255.0.0
255.254.0.0
/16
/15
1
2
4
8
16
32
64
128
256
512
1024
2048
8192
16,384
32,768
65,536
131,072
1
0
2
6
14
30
62
126
254
510
1022
2046
8190
16,382
32,766
65,534
131,070
1/256th
1/128th
1/64th
1/32nd
1/16th
1/8th
1/4th
1 half
1
2
4
8
32
64
128
256
512
1 / 5
Subnet Mask CIDR Prefix Total IP's Usable IP's Number of Class C networks
255.252.0.0
255.248.0.0
255.240.0.0
255.224.0.0
255.192.0.0
255.128.0.0
255.0.0.0
254.0.0.0
252.0.0.0
248.0.0.0
240.0.0.0
224.0.0.0
192.0.0.0
128.0.0.0
0.0.0.0
/14
/13
/12
/11
/10
/9
/8
/7
/6
/5
/4
/3
/2
/1
/0
262,144
524,288
1,048,576
2,097,152
4,194,304
8,388,608
16,777,216
33,554,432
67,108,864
262,142
524,286
1,048,574
2,097,150
4,194,302
8,388,606
16,777,214
33,554,430
67,108,862
1024
2048
4096
8192
16,384
32,768
65,536
131,072
262,144
134,217,728 134,217,726 1,048,576
268,435,456 268,435,454 2,097,152
536,870,912 536,870,910 4,194,304
1,073,741,824 1,073,741,822 8,388,608
2,147,483,648 2,147,483,646 16,777,216
4,294,967,296 4,294,967,294 33,554,432
子网掩码-掩码位-反掩码 对照表
反掩码： 掩码位： 正掩码：
127.255.255.255 = 1 = 128.0.0.0
2 / 5
63.255.255.255 = 2 = 192.0.0.0
31.255.255.255 = 3 = 224.0.0.0
15.255.255.255
7.255.255.255
3.255.255.255
1.255.255.255
0.255.255.255
0.127.255.255
0.63.255.255
0.31.255.255
0.15.255.255
0.7.255.255
0.3.255.255
=
=
=
=
=
=
=
=
=
=
=
5 =
6 =
7 =
8 =
9 =
10 =
11 =
12 =
13 =
14 =
3 / 5
248.0.0.0
252.0.0.0
254.0.0.0
255.0.0.0
255.128.0.0
= 4 240.0.0.0
255.192.0.0
255.224.0.0
255.240.0.0
255.248.0.0
255.252.0.0
0.1.255.255 = 15 = 255.254.0.0
0.0.255.255 = 16 = 255.255.0.0
0.0.127.255
0.0.63.255
0.0.31.255
0.0.15.255
0.0.7.255
0.0.3.255
0.0.1.255
0.0.0.255
0.0.0.127
0.0.0.63
0.0.0.31
=
=
=
=
=
=
=
=
=
=
21 =
22 =
23 =
24 =
25 =
26 =
27 =
4 / 5
255.255.192.0
255.255.224.0
255.255.240.0
255.255.248.0
255.255.252.0
255.255.254.0
255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
= 17 = 255.255.128.0
18 =
19 =
20 =
0.0.0.15 = 28 = 255.255.255.240
0.0.0.7 = 29 = 255.255.255.248
0.0.0.3
0.0.0.1
0.0.0.0
30 =
31 =
32 =
5 / 5
= 255.255.255.252
= 255.255.255.254
= 255.255.255.255
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