IPv4 Address Classes

IPv4 Address Classes

IP Version 4 Address Classes

IP version 4  is a 32 bit addressing system. The 32 bits are divided as 4 octets of 8 bits each.In IPv4 the ip address is categorized as Class  A, Class B, Class C, Class D,Class E.

 

IP version 4  is a 32 bit addressing system. The 32 bits are divided as 4 octets of 8 bits each.In IPv4 the ip address is categorized as Class  A, Class B, Class C, Class D,Class E.

 Class Leftmost Bit
              IP Address Range
 A  0  0.0.0.0       to      127.255.255.255
 B  10  128.0.0.0      to      191.255.255.255
 C  110  192.0.0.0      to      223.255.255.255
 D  1110  224.0.0.0      to      239.255.255.255
 E  1111  240.0.0.0      to      255.255.255.255

Class A, Class B, and Class C addresses are used on IP networks as host IP address. Class D, Class E addresses are not be used as host IP address on the network. Class D is used for multicasting where as class E is used for limited broadcasting.

  • Class A,Class B,Class C for host IP address
  • Class D for Multicast
  • Class E 

IP Address Class D for Multicast

Multicast addressing is  a technique which define a group of nodes and sending IP message to that group alone.It uses the link only once for message delivery.It use the class D addressing system.The 32 bit indicate a group name. It uses IGMP (Internet Group Management Protocol).
 
IP Address Class E 
 
In the IPv4  standard Class E addresses as reserved, that is they are not  used as host ip address on IP networks.The IP addresses  range from 255.0.0.0 through 255.255.255.255  are reserved and is  not  considered for the normal Class E range. The  IP broadcast to 255.255.255.255 deliver IP message to all node on the local network(LAN), that is this broadcast is limited with in the local network as the packet does not reach all node on the Internet.