'CIDR'에 해당되는 글 1건

  1. 2010.09.09 CIDR(Classless Inter-Domain Routing) 표기법 (1)

CIDR(Classless Inter-Domain Routing) 표기법

ITWeb/스크랩 2010.09.09 19:15

CIDR표기법
허용 IP
192.0.0.0/8
192.0.0.0 ~ 192.255.255.255
192.168.0.0/16
192.168.0.0 ~192.168.255.255
192.168.67.0/24
192.168.67.0 ~ 192.168.67.255

'0/n'은
IP주소에서 처음부터 n비트수 만큼이 네트워크 주소를 의미하고, 나머지 뒤의 비트들은 호스트 주소임을 의미합니다.

예를 들어
10.25.0.0/16 = 00001010 00011001 00000000 00000000
빨간색은 네트워크 주소, 파란색은 호스트 주소를 의미합니다.

IP/CIDR

Δ to last IP addr

Mask

Hosts (*)

Class

Notes

a.b.c.d/32

+0.0.0.0

255.255.255.255

1

1/256 C

 

a.b.c.d/31

+0.0.0.1

255.255.255.254

2

1/128 C

d = 0 ... (2n) ... 254

a.b.c.d/30

+0.0.0.3

255.255.255.252

4

1/64 C

d = 0 ... (4n) ... 252

a.b.c.d/29

+0.0.0.7

255.255.255.248

8

1/32 C

d = 0 ... (8n) ... 248

a.b.c.d/28

+0.0.0.15

255.255.255.240

16

1/16 C

d = 0 ... (16n) ... 240

a.b.c.d/27

+0.0.0.31

255.255.255.224

32

1/8 C

d = 0 ... (32n) ... 224

a.b.c.d/26

+0.0.0.63

255.255.255.192

64

1/4 C

d = 0, 64, 128, 192

a.b.c.d/25

+0.0.0.127

255.255.255.128

128

1/2 C

d = 0, 128

a.b.c.0/24

+0.0.0.255

255.255.255.000

256

1 C

 

a.b.c.0/23

+0.0.1.255

255.255.254.000

512

2 C

c = 0 ... (2n) ... 254

a.b.c.0/22

+0.0.3.255

255.255.252.000

1,024

4 C

c = 0 ... (4n) ... 252

a.b.c.0/21

+0.0.7.255

255.255.248.000

2,048

8 C

c = 0 ... (8n) ... 248

a.b.c.0/20

+0.0.15.255

255.255.240.000

4,096

16 C

c = 0 ... (16n) ... 240

a.b.c.0/19

+0.0.31.255

255.255.224.000

8,192

32 C

c = 0 ... (32n) ... 224

a.b.c.0/18

+0.0.63.255

255.255.192.000

16,384

64 C

c = 0, 64, 128, 192

a.b.c.0/17

+0.0.127.255

255.255.128.000

32,768

128 C

c = 0, 128

a.b.0.0/16

+0.0.255.255

255.255.000.000

65,536

256 C = 1 B

 

a.b.0.0/15

+0.1.255.255

255.254.000.000

131,072

2 B

b = 0 ... (2n) ... 254

a.b.0.0/14

+0.3.255.255

255.252.000.000

262,144

4 B

b = 0 ... (4n) ... 252

a.b.0.0/13

+0.7.255.255

255.248.000.000

524,288

8 B

b = 0 ... (8n) ... 248

a.b.0.0/12

+0.15.255.255

255.240.000.000

1,048,576

16 B

b = 0 ... (16n) ... 240

a.b.0.0/11

+0.31.255.255

255.224.000.000

2,097,152

32 B

b = 0 ... (32n) ... 224

a.b.0.0/10

+0.63.255.255

255.192.000.000

4,194,304

64 B

b = 0, 64, 128, 192

a.b.0.0/9

+0.127.255.255

255.128.000.000

8,388,608

128 B

b = 0, 128

a.0.0.0/8

+0.255.255.255

255.000.000.000

16,777,216

256 B = 1 A

 

a.0.0.0/7

+1.255.255.255

254.000.000.000

33,554,432

2 A

a = 0 ... (2n) ... 254

a.0.0.0/6

+3.255.255.255

252.000.000.000

67,108,864

4 A

a = 0 ... (4n) ... 252

a.0.0.0/5

+7.255.255.255

248.000.000.000

134,217,728

8 A

a = 0 ... (8n) ... 248

a.0.0.0/4

+15.255.255.255

240.000.000.000

268,435,456

16 A

a = 0 ... (16n) ... 240

a.0.0.0/3

+31.255.255.255

224.000.000.000

536,870,912

32 A

a = 0 ... (32n) ... 224

a.0.0.0/2

+63.255.255.255

192.000.000.000

1,073,741,824

64 A

a = 0, 64, 128, 192

a.0.0.0/1

+127.255.255.255

128.000.000.000

2,147,483,648

128 A

a = 0, 128

0.0.0.0/0

+255.255.255.255

000.000.000.000

4,294,967,296

256 A

 

 

참고.
http://en.wikipedia.org/wiki/CIDR

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