IP Address Classes

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 IP Address Classes

There are several classes like A, B, C, D, E. Most A, B, C class use for our networks. Class D, E use for Other network-related work and for research.

Class A [0] [0-126/127]

As we write IP in X syntax,

xxxxxxxx.__.__.__

 the IP class define in the first octet.  The first bit must be 0 in the first octet.

0xxxxxxx.__.__.__

So, we can define below as,

Class A first Address (lowest value in binary)  000000002

Class A first Address (lowest value in decimal) = 0

Class A first Address first IP = 00000000.00000000.00000000.00000000 = 0.0.0.0


Class A last Address (highest value in binary)  011111112

Class A first Address (highest value in decimal) = 127

Class A first Address last IP = 01111111.11111111.11111111.11111111 = 127.255.255.255


The class A highest value in decimal

   0     1     1     1      1  1   1   12
128+ 64+ 32 +16 + 8+4+2+ 1
  
    0+127 = 127

Same mechanism to other octets

Finally class A ip range is 0.0.0.0 - 127.255.255.255

but the 127 ip range is special. it's call loopback ip (127.0.0.0)
So we get Class A IP range approximately 0 -126 

Class B [10] [128-191]

The IP class define in the first octet.  The first bit must be 10 in the first octet.

10xxxxxx.__.__.__

So, we can define below as,

Class A first Address (lowest value in binary)  100000002

Class A first Address (lowest value in decimal) = 128

Class A first Address first IP = 10000000.00000000.00000000.00000000 = 128.0.0.0


Class A last Address (highest value in binary)  101111112

Class A first Address (highest value in decimal) = 191

Class A first Address last IP = 10111111.11111111.11111111.11111111 = 191.255.255.255


Class C [110] [192-223]

The IP class define in the first octet.  The first bit must be 110 in the first octet.

110xxxxx.__.__.__

So, we can define below as,

Class A first Address (lowest value in binary)  110000002

Class A first Address (lowest value in decimal) = 192

Class A first Address first IP = 11000000.00000000.00000000.00000000 = 192.0.0.0


Class A last Address (highest value in binary)  110111112

Class A first Address (highest value in decimal) = 223

Class A first Address last IP = 11011111.11111111.11111111.11111111 = 223.255.255.255


Class D [1110] [224-239]

The IP class define in the first octet.  The first bit must be 1110 in the first octet.

1110xxxx.__.__.__

So, we can define below as,

Class A first Address (lowest value in binary)  111000002

Class A first Address (lowest value in decimal) = 224

Class A first Address first IP = 11100000.00000000.00000000.00000000 = 224.0.0.0


Class A last Address (highest value in binary)  111011112

Class A first Address (highest value in decimal) = 239

Class A first Address last IP = 11101111.11111111.11111111.11111111 = 239.255.255.255


Class E [1111] [240-255]

The IP class define in the first octet.  The first bit must be 1111 in the first octet.

1111xxxx.__.__.__

So, we can define below as,

Class A first Address (lowest value in binary)  111100002

Class A first Address (lowest value in decimal) = 240

Class A first Address first IP = 11110000.00000000.00000000.00000000 = 240.0.0.0


Class A last Address (highest value in binary)  111111112

Class A first Address (highest value in decimal) = 255

Class A first Address last IP = 11111111.11111111.11111111.11111111 = 255.255.255.255



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