Network Class

[Sarvesh A Dhuri]

Hi

Why Class A Network starts from 1 to 126
Class B Network starts from 128 to 191
Class C Network starts from 192 to 223
Class D Network 224 to 239
& Class E Network from 240 to 255

Thanks in advance

[Muthukumar_5]

Hai,

There is a dafult formation allocated for every class. IPv4 address is divided as network-id and hostnumber.

class

class A 1 byte 3 byte
class B 2 byte 2 byte
class c 3 byte 1 byte
class d & 4 byte -----
class e



CLASS A - first byte
2 bit flag as 01
6 bit host id
00000001 to 01111110 = 1 to 127

We use 127 for loop back purpose.

Class B - first byte
10000000 to 1011111 = 128 to 191

Class C - first byte
11000000 to 1101111 = 192 to 223

class D - first byte
11100000 to 1110111 = 224 to 239

class E
11110000 to 1111111 = 240 to 255


Regards,
Muthukumar.