Hello guys being a while I update your guys on the topic IP  and today am going talk more deep into this topic.  First of all we need to understand that the designer of TCP/IP are well educated and knows more so they suite in five ranges of address called address classes, for the specific network uses and sizes. Changes in the internet since the early 90’s have rendered class full address more all but obsolete. One of the final eminent of class full address is the use of terms class A, class B and class C to describe common subnets. Below am going to put IP into their classes, subnet mask and also describe them please stay with me.

Class A
Class A subnet mask provides a small number of network addresses for network with a large number of nodes per network. In class A address you will find the following characteristics:
. Number of nodes per network approximately:  16,777,214
. Network ID portion: first octet.
Node ID portion: last three octet.
In wide range the class A address is use for large network, and far too big for most companies. Large telephone companies and ISPs lease most class A network address in development of internet.
Class B
In class B address we see a subnet mask that offers larger network numbers of address each with fewer numbers of nodes. In class B address will find the following characteristics:
Number of nodes per network :  65,534.
Network ID portion : first two octet.
Node ID portion  : last two octet.
Most organizations leased out the class B address for use o internet- connected  networks. Initially the class B address were many to go around but later it get depleted.
Class C
Class C address masks offers a large number of networks address for networks with a less number of nodes per network:
In class C address we will see the following characteristics
Number of nodes per network  : 254
Network ID portion  : first three octet.
Node ID portion: last octet.
Since there can be more class C network than any other type, they are therefore the only IP address generally available.
Lets then talk about the classless addressing and CDIR.
For the reason that the traditional IP classes have limitations on the number of availability address in each class, there are now various implement that utilize class addressing. in these schemes, there is no strict dividing line between the groups of address, and the network address /node address division is determine by hr number of 1 bits in the subnet mask.
In other hand classless inter-domain routing CDIR is a classless addressing method that considers a custom subnet mask as a 32 bit binary word. Mask bit can be move in one bit increments to provide the exact number of nodes and network required. The CDIR notation combines a network address with a number to represent the number of 1 bit in the mask. With CDIR, multiple class based networks can be represented as a single block. There are different values possible for each CDIR subnet mask. The  /24, /16, /and  /8 CDIR mask correspond with the class full ranges of class C, class B, and class A, respectively.
I hope you enjoy this article.
 Please stay with us as will take you  to IP subnetting in our coming soon post.


  • November 29, 2017 at 1:30 am

    I recently had a net working class and I learned about all of this. Your post was a nice refresher on the subject.


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