IPv4 Address Classes, Hosts for Classes of IP Addresses And Network IDs and Broadcast Addresses




IPv4 Address Classes







Class D Addresses

A Class D address begins with binary 1110 in the first 

octet.

First octet range 224 to 239.

Class D address can be used to represent a group of 

hosts called a host group, or multicast group.








Class E Addresses


First octet of an IP address begins with 1111

First octet range 240 to 255.

Class E addresses are reserved for experimental 

purposes and should not be used for addressing hosts 

or multicast groups. 




Hosts for Classes of 

IP Addresses





Class A (24 bits for hosts) 224 - 2* = 16,777,214
 maximum hosts
Class B (16 bits for hosts) 216 - 2* = 65,534 
maximum hosts
Class C (8 bits for hosts) 2- 2* = 254 maximum 
hosts
* Subtracting the network and broadcast reserved 
address



IP Addresses as Decimal 

Numbers









Network IDs and Broadcast 

Addresses


An IP address such as 176.10.0.0 that has all binary 
0s 
in the host bit positions is reserved for the network 
address.







An IP address such as 176.10.255.255 that has all

 binary 1s in the host bit positions is reserved for the

 broadcast address.





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