Network+ Subnetting Cheat Sheet

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Description and Tags

network and broadcast address dont count towards usable IPs

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9 Terms

1
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CIDR /24

Subnet Mask: 255.255.255.0

Total IPs: 256

Usable Host: 254

2
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CIDR /25

Subnet Mask: 255.255.255.128

Total IPs: 128

Usable Host: 126

3
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CIDR /26

Subnet Mask: 255.255.255.192

Total IPs: 64

Usable Host: 62

4
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CIDR /27

Subnet Mask: 255.255.255.224

Total IPs: 32

Usable Host: 30

5
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CIDR /28

Subnet Mask: 255.255.255.240

Total IPs: 16

Usable Host: 14

6
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CIDR /29

Subnet Mask: 255.255.255.248

Total IPs: 8

Usable Host: 6

7
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CIDR /30

Subnet Mask: 255.255.255.252

Total IPs: 4

Usable Host: 2

8
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CIDR /31

Subnet Mask: 255.255.255.254

Total IPs: 2

Usable Host: 2

9
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CIDR /32

Subnet Mask: 255.255.255.255

Total IPs: 1

Usable Host: 1