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What IPv4 means
IPv4 stands for Internet Protocol version 4. It is the version of the IP protocol that has supported a huge part of the Internet for many years and is still heavily used today.
Its main job is to give devices a unique address so they can communicate with each other inside a local network or across the Internet.
Key idea: when you see an IP address with four numbers separated by dots, you are almost always looking at an IPv4 address.
What IPv4 is used for
IPv4 is used to identify devices and route network traffic to the right place.
Identification
It lets one device be distinguished from another on a network.
Communication
It allows computers, phones, routers, and servers to exchange data.
Browsing
It makes websites, apps, and remote services reachable.
Local network
It is also used at home or in the office for printers, routers, NAS devices, and other equipment.
If you want the broader picture before diving into specific protocols, this guide fits perfectly: what is an IP address.
How an IPv4 address is written
An IPv4 address has four numeric blocks separated by dots.
Typical examples:
- 192.168.1.1
- 192.168.0.25
- 10.0.0.8
- 8.8.8.8
That format is exactly what makes IPv4 so recognizable: short, familiar, and still everywhere.
Private IPv4 and public IPv4
An IPv4 address can be private or public, depending on where it operates.
Private IPv4
Used inside a local network. Common examples: 192.168.x.x, 10.x.x.x.
Public IPv4
The address that identifies your connection on the Internet.
To go one level deeper on this, here is the comparison: local IP vs public IP.
Difference between IPv4 and IPv6
IPv4 is the classic version. IPv6 is the newer version, created to provide many more addresses and adapt better to the growth of the Internet.
IPv4
Short format, four numeric blocks, and still widely used today.
IPv6
Much longer format, more capacity, and gradual adoption.
Later in this block, this will link perfectly with the dedicated guide: what is IPv6.
Examples of IPv4 addresses
Some practical IPv4 examples:
- 192.168.1.1 is often the router IP in many homes
- 192.168.1.34 can be your laptop’s local IP
- 10.0.0.5 can be a device in another private network
- 8.8.8.8 is a famous example of a public IP
If you want to see yours inside your home or office network, this is the strong internal link: what is my local IP address.
Quick summary: IPv4 is the classic version of the IP protocol. It uses four numeric blocks and is still essential for local networks, routers, and a large part of the Internet.
Frequently asked questions
What is IPv4 in simple words?
It is version 4 of the Internet Protocol and it uses addresses such as 192.168.1.1.
Is IPv4 still used today?
Yes. It is still the foundation of many home networks, business networks, and online services.
What format does an IPv4 address have?
It has four numbers separated by dots, for example 192.168.0.25.
Can IPv4 be private and public?
Yes. It can be used inside a local network as a private IP or on the Internet side as a public IP.
What is the difference between IPv4 and IPv6?
IPv4 is the classic and shorter format. IPv6 is more modern, longer, and provides many more available addresses.