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Know your CIDR Notation
Know your CIDR Notation
6
Computer Science
Professional
08/02/2009

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Cards

Term

 

 

What do we know about a /25 CIDR?

Definition

/25

  • 128 bit mask
  • 1 bit on 7 bits off (10000000)
  • Block size 128
  • 2 Subnets, 126 hosts each
Term

 

 

What do we know about a /26 CIDR?

Definition

/26

  • 192 bit mask
  • 2 bits on 6 bits off (11000000)
  • Block size 64
  • 4 Subnets, 62 hosts each
Term

 

 

What do we know about a /27 CIDR?

Definition

/27

  • 224 bit mask
  • 3 bits on 5 bits off (11100000)
  • Block size 32
  • 8 Subnets, 30 hosts each
Term

 

 

What do we know about a /28 CIDR?

Definition

/28

  • 240 bit mask
  • 4 bits on 4 bits off (11110000)
  • Block size 16
  • 16 Subnets, 14 hosts each
Term

 

 

What do we know about a /29 CIDR?

Definition

/29

  • 248 bit mask
  • 5 bits on 3 bits off (11111000)
  • 8 Block size
  • 32 Subnets, 6 hosts each
Term

 

 

What do we know about a /30 CIDR?

Definition

/30

  • 252 bit mask
  • 6 bits on 2 bits off (11111100)
  • 4 Block size
  • 64 Subnets, 2 hosts each
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