Subnetting – Notes, Images, Videos

I Found These Images Very Helpful

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Best Video for Learning Subnetting

 

 

Classes

A – Private – Not routable on the internet

  •  Range: 1-127
  • CIDR: /8
  • N.H.H.H
  • 255.0.0.0
  • 0

B

  • Range: 128 – 191
  • CIDR: /16
  • 172.16.0.0 – 172.31.255.255
  • N.N.H.H
  • 255.255.0.0
  • 10

C

  • Range: 192 – 223
  • CIDR: /24
  • 192.168.0.0 – 192.168.255.255
  • N.N.N.H
  • 255.255.255.0
  • 110

 

Bit Values

128     64     32     16     8    4     2     1

xxxxxxxx.xxxxxxxx.xxxxxxxx.xxxxxxxx

CIDR – how many bits on. each x is a bit

Network is everything that is on.

Host is everything that is off.

Hosts are numbers on the right subtract 2.

Subnets are from left to right and count how many bits.

 

Example Breakdown:

192.168.100.97 /27

255 . 255 . 255.  111|00000

1 1 1 0 0 0 0 0

|128 64 32|

32 is increment

x.x.x.32

x.x.x.64

x.x.x.96 +31 = 127

96 subnet

broadcast 127

 

Examples Breakdown:

 

255.255.254.0

x.x.11111111|0.0

2 4 8 16 32 64 128

512 – 2 = 510

 

 

BIT =  Decimal

1    =    128

2    =    192

2    =    224

4     =   240

5     =   248

6     =   252

7     =   254

8     =   255

 

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