CIDR Notation

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/25
CIDR /25
Mask 128
Bits 1 bit on and 7 bits off
Block Size 128
Subnets 2 - 0 and 128
Each with 126 hosts
/26
CIDR /26
Mask 192
Bits 2 bits on and 6 bits off
Block Size 64
Subnets 4 - 0, 64, 128, 192
Each with 62 hosts
/27
CIDR /27
Mask 224
Bits 3 bits on and 5 bits off
Block Size 32
Subnets 8 - 0, 32, 64, 96, 128, 160, 192, 224
Each with 30 hosts
/28
CIDR /28
Mask 240
Bits 4 bits on and 4 bits off
Block Size 16
Subnets 16 - 0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240
Each with 14 hosts
/29
CIDR /29
Mask 248
Bits 5 bits on and 3 bits off
Block Size 8
Subnets 32 - 0, 8 - 248
Each with 6 hosts
/30
CIDR /30
Mask 252
Bits 6 bits on and 2 bits off
Block Size 4
Subnets 64 - 0, 4 - 252
Each with 2 hosts
CIDR
Notation
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