What is IPv4?

IPv4 (Internet Protocol version 4) is the fourth version of the Internet Protocol used to identify devices on a network.

• It uses a 32-bit address system
• Written in format: 192.168.1.1
• Contains 4 octets (numbers)

Example:

👉 185.107.80.231

IPv4 is a connectionless protocol, meaning it sends data without guaranteeing delivery, making it fast and efficient.

How Does the Internet Work?

The internet is a massive network of connected devices and servers worldwide.

• Data travels through physical cables and networks
• Each device is identified using an IP address
• Websites are hosted on servers inside data centers

When you type a website name, your system finds its IP address and connects to the server.

What is an IP Address?

An IP address is a unique identifier assigned to each device on a network.

Types of IP Addresses:

• Public IP – Used on the internet
• Private IP – Used inside local networks

Routers use public IPs to connect devices to the internet.

DNS (Domain Name System)

The DNS (Domain Name System) converts domain names into IP addresses.

Example:

Typing google.com → DNS converts it → IP address

DNS works like a phonebook of the internet, helping users access websites easily.

History of IPv4

• Introduced in 1981 (RFC 791)
• Adopted by ARPANET in 1983
• Developed by pioneers like Vint Cerf and Robert Kahn

IPv4 became the standard protocol for internet communication.

IPv4 Today

IPv4 is still widely used, but it faces challenges like:

• IP address exhaustion
• Limited scalability
• Higher cost of IP addresses

To manage this, technologies like CIDR (Classless Inter-Domain Routing) were introduced.

IPv4 Classes

IPv4 addresses are divided into five classes:

IPv4 Subnetting :

Subnetting divides a large network into smaller networks.

Example:

Subnet mask: 255.255.255.0

Benefits:

• Better network performance
• Improved security
• Efficient IP usage

Benefits of IPv4

Despite limitations, IPv4 is still widely used because:

• Compatible with all devices
• Easy to configure
• Simple addressing system
• Strong global support

IPv4 vs IPv6

IPv6 solves IPv4 limitations but adoption is still ongoing.

How NAT Works (Network Address Translation)

NAT (Network Address Translation) allows multiple devices to share one public IP.

Types of NAT:

• Static NAT
• Dynamic NAT
• PAT (Port Address Translation)

Benefits:

• Saves IP addresses
• Improves security
• Enables multiple device connectivity

How to Find Your IPv4 Address

Method 1: Google

Search 👉 “What is my IP”

Method 2: Windows

Command Prompt → ipconfig

Method 3: Linux/macOS

Terminal → ip addr

Future of IPv4

The world is slowly shifting toward IPv6, but IPv4 is still widely used.

Current Trends:

• Dual-stack systems (IPv4 + IPv6)
• Growing demand for IP addresses
• Rising IPv4 prices

Countries like India and Germany are leading IPv6 adoption.

Conclusion

IPv4 remains the foundation of internet communication, even after decades of use. While IPv6 is the future, IPv4 continues to play a critical role due to its simplicity, compatibility, and widespread adoption.

As internet usage grows, the demand for IP addresses will increase, making IPv4 still valuable in today’s digital ecosystem.

FAQs

1. What is IPv4 in simple terms?

IPv4 is a system that assigns unique addresses to devices on the internet.

2. Why is IPv4 still used?

Because it is simple, widely supported, and compatible with most devices.

3. What is IPv4 address format?

It is a 32-bit address written as four numbers (e.g., 192.168.1.1).

4. What is the difference between IPv4 and IPv6?

IPv6 offers more addresses and better security than IPv4.