子网掩码、反掩码对照表

2021/02/27 21:20 交换机 26 0

 


子网掩码

掩码位

总IP数

可用主机数

C类网段数量

255.255.255.255

/32

1

1

1/256th

255.255.255.254

/31

2

0

1/128th

255.255.255.252

/30

4

2

1/64th

255.255.255.248

/29

8

6

1/32nd

255.255.255.240

/28

16

14

1/16th

255.255.255.224

/27

32

30

1/8th

255.255.255.192

/26

64

62

1/4th

255.255.255.128

/25

128

126

1 half

255.255.255.0

/24

256

254

1

255.255.254.0

/23

512

510

2

255.255.252.0

/22

1024

1022

4

255.255.248.0

/21

2048

2046

8

255.255.240.0

/20

4096

4094

16

255.255.224.0

/19

8192

8190

32

255.255.192.0

/18

16384

16382

64

255.255.128.0

/17

32768

32766

128

255.255.0.0

/16

65536

65534

256

255.254.0.0

/15

131072

131070

512

255.252.0.0

/14

262144

262142

1024

255.248.0.0

/13

524288

524286

2048

255.240.0.0

/12

1048576

1048574

4096

255.224.0.0

/11

2097152

2097150

8192

255.192.0.0

/10

4194304

4194302

16384

255.128.0.0

/9

8388608

8388606

32768

255.0.0.0

/8

16777216

16777214

65536

254.0.0.0

/7

33554432

33554430

131072

252.0.0.0

/6

67108864

67108862

262144

248.0.0.0

/5

134217728

134217726

1048576

240.0.0.0

/4

268435456

268435454

2097152

224.0.0.0

/3

536870912

536870910

4194304

192.0.0.0

/2

1073741824

1073741822

8388608

128.0.0.0

/1

2147483648

2147483646

16777216

0.0.0.0

/0

4294967296

4294967294

33554432

反掩码

掩码位

正掩码

0.0.0.0

32

255.255.255.255

0.0.0.1

31

255.255.255.254

0.0.0.3

30

255.255.255.252

0.0.0.7

29

255.255.255.248

0.0.0.15

28

255.255.255.240

0.0.0.31

27

255.255.255.224

0.0.0.63

26

255.255.255.192

0.0.0.127

25

255.255.255.128

0.0.0.255

24

255.255.255.0

0.0.1.255

23

255.255.254.0

0.0.3.255

22

255.255.252.0

0.0.7.255

21

255.255.248.0

0.0.15.255

20

255.255.240.0

0.0.31.255

19

255.255.224.0

0.0.63.255

18

255.255.192.0

0.0.127.255

17

255.255.128.0

0.0.255.255

16

255.255.0.0

0.1.255.255

15

255.254.0.0

0.3.255.255

14

255.252.0.0

0.7.255.255

13

255.248.0.0

0.15.255.255

12

255.240.0.0

0.31.255.255

11

255.224.0.0

0.63.255.255

10

255.192.0.0

0.127.255.255

9

255.128.0.0

0.255.255.255

8

255.0.0.0

1.255.255.255

7

254.0.0.0

3.255.255.255

6

252.0.0.0

7.255.255.255

5

248.0.0.0

15.255.255.255

4

240.0.0.0

31.255.255.255

3

224.0.0.0

63.255.255.255

2

192.0.0.0

127.255.255.255

1

128.0.0.0

255.255.255.255

0

0.0.0.0

 

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