An IP address (Internet Protocol address) is the special numerical address of each of the featured devices which are connected to a network. It enables computers, telecommunications devices, servers and intelligent devices to recognize each other through the internet.With IPv4 (Internet Protocol version 4), an IP address is a number of 32 bit denoted in four blocks separated by dots like:192.168.1.1
All these are referred to as octets and they all lie between a range of 0 to 255.
The IPv4 addresses were classified so as to accommodate the billions of addresses. It is possible to use such classes to categorize networks in terms of size, purpose and capacity.
Simply put:
👉 IP classifications determine the size of a network.
Sharp ones characterize the ability of a network.
camp they aid in organizing the interaction in the internet.
Why IP Address Classes Exist
In coming up with the design of the first internet, the engineers had to develop a means of allocating addresses in a logical manner. Organizations needed to obtain millions of addresses as compared to other organizations which needed to obtain a few hundreds. Addresses would not be organized and would be in a chaotic manner.
The classes of IP addresses were added to:
• Organize networks by size
• Simplify routing
Locate addresses in a very efficient manner.
Offer Home and enterprises networks.
• Reduce address waste
Although the current networking involves the application of CIDR (Classless Inter-Domain Routing), the management of IP classes is yet to be taken care of in regard to study, testing and fundamental knowledge in networking.
The Five IPv4 Address Classes
The IPv4 addresses can be broken in five major classes:
👉 Class A
👉 Class B
👉 Class C
👉 Class D
👉 Class E
The classes have various networking purposes.
Class A IP Address
The Class A address space is used under the eventuality that the network is quite large like a multinational corporation, state network and global service providers.
Range
1.0.0.0 – 126.255.255.255
Default Subnet Mask
255.0.0.0
Key Features
was aiming at more than 16 million hosts per network.
Major infrastructures are suitable.
The initial octet is the identification of the network.
Left-unchanged octets can be used to identify the hosts.
Class A networks are not very common as they assign huge number of addresses to an individual organization. At the time of the inception of the internet history, the Class A blocks were allocated to a significant number of large organizations and hence, they were not used well, and thus, resulted in depletion of the IPv4 addresses.
The most notable of them is the class A which is known as mega-network class.
Usage A: government network, high capacity IP, big enterprise network.
Class B IP Address
The class b addresses are intended to serve medium and huge networks like universities, corporations and large organizations.
Range
128.0.0.0 – 191.255.255.255
Default Subnet Mask
255.255.0.0
Key Features
• Scales to 65, 534 hosts on network.
Equal network and equal host capacity.
First and Second octets represent network ID.
Left behind octets are hosts.
Class B networks lie between large Class A networks and small Class C networks. They are scalable and flexible and, therefore, can be implemented to those organizations that do not have thousands of millions of devices, but thousands.
Class B is traditionally quite a bit of enterprise infrastructures being touched upon since it offers good balance.
Keywords: corporative networks, university networks, medium IP allocation.
Class C IP Address
The class c addresses that are implemented in the home networks and small business would be the most popular ones.
Range
192.0.0.0 – 223.255.255.255
Default Subnet Mask
255.255.255.0
Key Features
• Supports up to 254 hosts
• Most suitable to the local area network (LAN).
When you had fitted a home router and then had discovered the addresses such as:
192.168.1.x
you were finished with Class C addressing.
This is a small category of environment which is efficiency and simplicity conscious. This has seen the Class C address the backbone of the personal home networking in the world due to its popularity.
The so called small network workhorse is the Class C.
Keywords: LAN addressing, home networking, IP of small business.
Class D IP Address (Multicast)
Classes D addresses are not assigned to single devices. They replace them with them in order to multicast communicate.
Range
224.0.0.0 – 239.255.255.255
Purpose
One of them is multicast where the number of receivers is large, and only one sender exists. This saves bandwidth and efficiency is enhanced.
Common uses include:
• Video streaming
• Online conferences
• IPTV broadcasting
• Real-time data distribution
This is the case because the Class D is so essential in current multimedia networking which is not visible to the end consumers.
Experimental Class E IP Address.
The other type of address is the e address that is simply meant to carry out research and experiment.
Range
240.0.0.0 – 255.255.255.255
This type of addresses employed by Procare across a public network and most internet equipment will be blocked. They are there to be tried and measures instituted in another date.
In IPv4, class E experimentation frontier is used.
Index Keywords: responding to research, experimental IP range.
IP Decision Networks Process to Classes.
Classes size is calculated:
✔ Network identification ✔ Host identification
The few bits that have been delegated to the network segment, the more hosts there are and vice versa. This architecture ensured that the early internet engineers could in a logical way allocate address blocks based on the organizational need.
The information regarding this concept is the foundation of:
• Subnetting
• Routing
• Network architecture
• Cybersecurity planning
________________________________________
Importance of Learning IP Address Classes.
Even though the contemporary networking uses classless addressing, IP classes have high values both in education and application.
The IP classes are applicable in the knowledge of:
✔ Network design
✔ Subnet planning
✔ Router configuration
✔ The basics of cybersecurity.
They are the networking theory components.
Without the concept of IP classes, then the advanced concepts of subnetting and routing could not exist.
______________________________________
Quick Memory Trick
A simple way to remember:
• Class A = Huge networks
• Class B = Big networks
• Class C = Small networks
• Class D = Multicast
• Class E = Experimental
Or:
👉 A = All devices
👉 B = Business
👉 C = Company/Home
👉 D = Distribution
👉 E = Experiment
________________________________________
Final Summary
The IP address classes were made to categorize the IPv4 networks based on size and application. They help in identifying the identification of devices, network scaling and even the movement of communication over the internet.
Class A is in charge of massive infrastructures.
Class B, in its turn, is utilized in corporate settings.
Class C covers small enterprises and residential.
Class D supports communication in a multicast.
• Class E exists for research
On the one hand, the IP classes continue to play an important role in any networking amateur in the classless networking world today. Their knowledge provides a nice background of the further networking concepts and the practical skills in IT.
