Some Important Information on IP Address.

Class A IP address is used for a network with a large number of hosts.

Class B IP address is used for a network with a medium number of hosts.

Class C IP address is used for a network with less number of hosts.

IP Address ClassPossible range of IP address
Class A0.0.0.0   through 127.255.255.255
Class B128.0.0.0 through 191.255.255.255
Class C192.0.0.0 through 223.255.255.255
Class D224.0.0.0 through 239.255.255.255
Class E240.0.0.0 through 247.255.255.255

The Class D IP addresses used for multicasting.

The Class E IP addresses are reserved for experimental purpose.

The maximum number of networks and hosts that can be represented using the various IP address classes is shown below in the table:

IP Address ClassMaximum number of N/WMaximum no of hosts per N/W
Class A126 (2^7 – 2)16777214 (2^24 – 2)
Class B16384 (2^14)65534 (2^16 – 2)
Class C2097152 (2^21)254 (2^8 – 2)
Class D——————————————————————————
Class E——————————————————————————

Some IP Address are not available for general internet use, They are used for special purpose:

IP AddressDescription
0.0.0.0Local host.
127.xxx.xxx.xxxLocal loopback address. The value of the last 3 bytes are ignored.  The datagram with this IP address is never transmitted over the network.
xxx.0.0.0

 

xxx.xxx.0.0

xxx.xxx.xxx.0

Local host IP address.  The x represents the network ID bits
0.xxx.xxx.xxx

 

0.0.xxx.xxx

0.0.0.xxx

The IP address of a host in the local network.  The x represents the host ID bits.
255.255.255.255Limited Broadcast address.  A datagram with this address will be received and processed by all the hosts in the local network.  This datagram is not forwarded to other networks by routers.
xxx.255.255.255

 

xxx.xxx.255.255

xxx.xxx.xxx.255

Directed broadcast address.  The datagram with this IP address is received by all the hosts in the specified network.  The x  represents the network ID bits
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