What Is CIDR? Goal Of CIDR Explained!

CIDR, which basically stands for Classless Inter-Domain Routing, is well known to be called supernetting.

It functions as an amazing method to allocate different IP addresses in a very flexible way. It creates a special and unique granular kind of identifier, mainly for networks as well as personal devices.

CIDR was first released in the year 1993 to work as an alternative to different wireless network routers.

The function was basically to manage the traffic of the network, based particularly on the various classes of IP addresses and the determined subnetworks for proper routing based on the class of IP addresses.

The goal of CIDR

The main purpose of Classless Intern Domain Routing, or CIDR, was to identify the issues related to scalability with classful IP addresses.

The IP addresses are mainly based on three different classes, which are as follows:

1. Class A

2. Class B

3. Class C

All these classes here define the capacity of the IP address classes that trigger scalability problems.

Let’s find out the IP addresses of each of the above-provided classes.

1. Class A capacity = 16,581,375 IP addresses.

2. Class B=65,536 IP addresses

3. Class C = 256 IP addresses

 Classful Addressing

When we talk about classful addressing, it’s no secret that it previously resulted in inefficiency in address usage and routing.This was due to the presence of various classes’ stringent restrictions.

Let’s take a simple example: Suppose if 300 Internet protocol addresses were required, then Class B would be needed, leaving 16,281 unused.

The best thing about the CIDR is that it lets the IP addresses not only be variable but also free of any size restrictions imposed by the above-mentioned classes.

Because it is not limited by category, CIDR could organise IPs into subnets regardless of their value. Since CIDR practically enables the consolidation of several subnetworks into a supernet for packet delivery, it is known as “supernetting.”


Through appending this amount to the Internet name, this approach to conventional IP packets allows you to define a lot of notable parts, which helps compensate for the transit or connectivity part. It not only saves domain storage but also allows routers to specify network addresses in a more flexible manner.

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