Published: May 14, 2026 By: Rungruang Huanraluek
What is IPv4? Understanding IP Address: The Foundation of Networks and the Internet
What is IPv4? Getting to Know Internet Protocol Version 4 the Easy Way
IPv4 (Internet Protocol Version 4) is the most widely used IP Address standard on computer networks and the internet today. Its primary role is to assign a unique "identification number" to each device, allowing them to communicate, exchange data, and connect through the network accurately.
Whether it's a computer, smartphone, IP Camera, Wi-Fi system, Smart TV, or Serverevery device connected to a network needs an IP Address to identify its location for data transmission. IPv4 remains the core foundation of internet and network systems globally.
To put it simply, IPv4 is like the "home address" of a device on a network. When data is sent, the system must know where the source and destination are located to deliver the information correctly.
What is the format of IPv4?
IPv4 uses a 32-bit address space, displayed as four sets of numbers separated by dots (Dot-Decimal Notation), for example:
· 192.168.1.1
· 10.0.0.1
· 172.16.1.1
Each set of numbers ranges from 0 to 255, allowing IPv4 to support approximately 4.3 billion unique IP addresses.
How does IPv4 work in a network system?
Every time you open a website, watch YouTube, send an email, or use online services, your device uses IPv4 to find and communicate with the destination device across the internet.
For example:
· When you open a website, the DNS system translates the website name into an IPv4 Address.
· Routers use IPv4 to route data to the correct destination.
· Servers use the IP Address to send information back to the user.
In essence, IPv4 is the "universal language" that allows devices on the internet to talk to each other.
What are Public IP and Private IP?
In the IPv4 system, IP Addresses can be categorized into two main types based on their usage: Public IP and Private IP.
What is a Public IP?
A Public IP is an IP Address used on the actual internet, assigned by an Internet Service Provider (ISP). Each Public IP is unique worldwide.
Public IPs are used to connect and communicate with external systems, such as websites, Cloud services, or internet-based servers.
What is a Private IP?
A Private IP is an IP Address used within a Local Area Network (LAN), such as a home, office, hotel, or organization. These cannot be accessed directly from the external internet.
Common Private IP ranges include:
· 192.168.x.x
· 10.x.x.x
· 172.16.x.x 172.31.x.x
Routers handle the translation of Private IPs to a Public IP via a process called NAT (Network Address Translation).
Why is IPv4 running out?
Although IPv4 supports 4.3 billion addresses, the number of internet-connected devices has exploded, including:
· Smartphones
· IoT Devices
· Smart Homes
· IP Cameras
· Cloud Systems
· Smart TVs
· Intelligent Vehicles
This has led to a global shortage of IPv4 addresses, which is the primary reason for the development and adoption of IPv6 to support the future of networking.
Which systems rely on IPv4?
Currently, IPv4 is still the vital foundation for various technologies, such as:
· LAN systems
· Wi-Fi systems
· IPTV systems
· CCTV IP Cameras
· VoIP systems
· Servers and NAS
· Cloud Computing
· Data Centers
· Smart Homes and IoT
Almost every system connected to the internet still operates on the foundation of IPv4.
What are the advantages of IPv4?
Key highlights of IPv4 include:
· It is a globally recognized and used standard.
· Supported by almost all types of network hardware.
· Easy to configure and manage.
· Performs well for general LAN and internet use.
· Highly compatible with legacy network systems.
Because of these factors, IPv4 remains dominant even as IPv6 grows in popularity.
IPv4 vs. IPv6: Whats the difference?
IPv4 is the original standard using a 32-bit number, while IPv6 is the new standard using a 128-bit number, allowing for a significantly larger number of IP addresses.
IPv6 was specifically designed to solve the IP address shortage and support the future growth of the internet, especially for the IoT and Smart Device era.
Summary: What is IPv4 and why is it vital for Networks?
IPv4 is the Internet Protocol Version 4 standard used to assign IP Addresses to devices on networks and the internet so they can find, connect, and communicate with each other correctly.
Even though IPv6 is being rolled out, IPv4 remains the essential infrastructure for LAN, Wi-Fi, CCTV IP, IPTV, Cloud, and enterprise networks worldwide.
Understanding IPv4 is a fundamental skill for general users, IT professionals, and organizations looking to design and manage efficient, sustainable network systems in the digital age.
