Classful IPv4 Addresses

IPv4 Addresses and IPv4 Subnetting

CIDR SUBNET MASK

ADDRESSES

WILDCARD MASK

Classful IPv4 Addresses

/32

1

Class A

0.0.0.0-127.255.255.255

/31

255.255.255.254

2

Class B

128.0.0.0-191.255.255.255

/30

255.255.255.252

4

Class C

192.0.0.0-223.255.255.255

/29

255.255.255.248

8

Class D

224.0.0.0-239.255.255.255

/28

255.255.255.240

16

0.0.0.15

Class E

240.0.0.0-255.255.255.255

/27

255.255.255.224

32

0.0.0.31

Private IPv4 Addresses

/26

255.255.255. 192

64

0.0.0.63

/25

255.255.255.128

128

0.0.0.127

/24

255.255.255.0

256

0.0.0.255

/23 255.255.254.0

512

0.0.1.255

/22

255.255.252.0

1024

0.0.3.255

/21

255.255.248.0

2048

0.0.7.255

/20

255.255.240.0

4096

0.0.15.255

Local Host

/19

255.255.224.0

8192

0.0.31.255

APIPA

10.0.0.0-10.255.255.255

172.16.0.0-172.31.255.255

192.168.0.0-192.168.255.255

Special IPv4 Addresses

127.0.0.0-127.255.255.255

169.254.0.0-169.254.255.255

/18 255.255.192.0

16384

0.0.63.255

Bogon IPv4 Addresses

/17

255.255.128.0

32768

0.0.127.255

/16

255.255.0.0

65536

0.0.255.255

0.0.0.0/8

This network

/15

255.254.0.0

131072

0.1.255.255

10.0.0.0/8

Private IPv4 Address Block

/14

255.252.0.0

262144

0.3.255.255

100.64.0.0/10

Carrier-grade NAT

/13

255.248.0.0

524288

0.7.255.255

127.0.0.0/8

Loopback

/12

255.240.0.0

1048576

0.15.255.255

127.0.53.53

Name collision occurrence

/11

255.224.0.0

2097152

0.31.255.255

169.254.0.0/16

Link local

/10

255.192.0.0

4194304

0.63.255.255

172.16.0.0/12

Private IPv4 Address Block

19

255.128.0.0

8388608

0.127.255.255

192.0.0.0/24

IETF protocol assignments

/8

255.0.0.0

16777216

0.255.255.255

192.0.2.0/24

TEST-NET-1

17

254.0.0.0

33554432

1.255.255.255

192.168.0.0/16

Private IPv4 Address Block

/6

252.0.0.0

67108864

3.255.255.255

198.18.0.0/15

Network benchmark testing

/5

248.0.0.0

134217728

7.255.255.255

198.51.100.0/24

TEST-NET-2

/4

240.0.0.0

268435456

15.255.255.255

203.0.113.0/24

TEST-NET-3

/3

224.0.0.0

536870912

31.255.255.255

224.0.0.0/4

Multicast

/2

192.0.0.0

1073741824

63.255.255.255

240.0.0.0/4

Reserved

/1

128.0.0.0

2147483648

127.255.255.255

255.255.255.255/32

Limited broadcast

10

0.0.0.0

4294967296

255.255.255.255