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IPv4 Subnet Chart

Class address ranges:

  • Class A = 1.0.0.0 to 126.0.0.0
  • Class B = 128.0.0.0 to 191.255.0.0
  • Class C = 192.0.1.0 to 223.255.255.0

Reserved address ranges for private (non-routed) use

  • 10.0.0.0 -> 10.255.255.255
  • 172.16.0.0 -> 172.31.255.255
  • 192.168.0.0 -> 192.168.255.255

Other reserved addresses:

  • 127.0.0.0 is reserved for loopback and IPC on the local host
  • 224.0.0.0 -> 239.255.255.255 is reserved for multicast addresses

Network Bits

Subnet Mask

Number of Subnets

Number of Hosts

/8

255.0.0.0

0

16777214

/9

255.128.0.0

2 (0)

8388606

/10

255.192.0.0

4 (2)

4194302

/11

255.224.0.0

8 (6)

2097150

/12

255.240.0.0

16 (14)

1048574

/13

255.248.0.0

32 (30)

524286

/14

255.252.0.0

64 (62)

262142

/15

255.254.0.0

128 (126)

131070

/16

255.255.0.0

256 (254)

65534

/17

255.255.128.0

512 (510)

32766

/18

255.255.192.0

1024 (1022)

16382

/19

255.255.224.0

2048 (2046)

8190

/20

255.255.240.0

4096 (4094)

4094

/21

255.255.248.0

8192 (8190)

2046

/22

255.255.252.0

16384 (16382)

1022

/23

255.255.254.0

32768 (32766)

510

/24

255.255.255.0

65536 (65534)

254

/25

255.255.255.128

131072 (131070)

126

/26

255.255.255.192

262144 (262142)

62

/27

255.255.255.224

524288 (524286)

30

/28

255.255.255.240

1048576 (1048574)

14

/29

255.255.255.248

2097152 (2097150)

6

/30

255.255.255.252

4194304 (4194302)

2

 

 

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