IP Address Format And Subnet Mask

IP Address Format And Subnet Mask :- IP Address is divided into Network and Host Portion and Subnet Mask can differentiates Network Portion and Host Portion. Here N is Network and H is Host.
IP Address Format And Subnet Mask
Class A is written as N.H.H.H
Class B is written as N.N.H.H
Class C is written as N.N.N.H

Class A IP Address Format And Subnet Mask :-
Class A Octet Format is written as N.H.H.H
Network Bits – 8                   Host Bits – 24

Number of Network 28-1 (-1 is priority Bit For Class A)
27 = 128
128 – 2 (-2 for 0 and 127 Network) 126 Networks

Number of Host = 224 – 2 (-2 For Network IP and Broadcast IP) = 16777214 Host/Network

Default Subnet Mask for Class A is : 255.0.0.0

Class B IP Address Format And Subnet Mask :-
Class B octet Format is N.N.H.H
Network Bits – 16                 Host Bits – 16

Number of Network = 216-2 (-2 is priority Bit for Class B)
214 = 16384 Networks

Number of Host = 216 – 2 (-2 For Network IP and Broadcast IP) = 65534 Host/Network

Default Subnet Mask for Class B is : 255.255.0.0

Class C IP Address Format And Subnet Mask :-
Class C octet Format is N.N.N.H
Network Bits – 24                 Host Bits – 8

Number of Network = 224-3 (-3 is priority Bit for Class C)
221 = 2097152 Networks

Number of Host = 28 – 2 (-2 For Network IP and Broadcast IP)
= 254 Host/Network

Default Subnet Mask for Class C is : 255.255.255.0

Example Of Network and Broadcast ID or Address

10.0.0.0  (Network IP Address)
10.0.0.1
.
.                                   (Valid IP Address)
.
10.255.255.254
10.255.255.255  (Broadcast IP Address)

Private IP Address :- These IP address are use in Private Network such as Home Network, Office Network, in a organization like ISRO, Google, TATA etc. It means we use in a LAN Network. Private IP address can not communicate Public Network.
Private IP Address
Private IP Address Table :-
Class
Start IP
End IP
Class A
10.0.0.0
10.255.255.255
Class B
172.16.0.0
172.31.255.255
Class C
192.168.0.0
192.168.255.255


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