IPv4 and IPv6 are two versions of the Internet Protocol used to identify devices and networks and enable communication across IP-based networks.
IPv4 has been used since the early development of the modern internet and remains widely deployed. IPv6 was developed to provide a much larger address space and support the continued growth of internet-connected devices and networks.
What Is IPv4?
IPv4 stands for Internet Protocol version 4.
It uses a 32-bit address system. IPv4 addresses are normally written as four decimal numbers separated by periods.
For example:
192.0.2.1
Each section can contain a value from 0 to 255.
IPv4 provides approximately 4.3 billion possible addresses. While this was a very large number when IPv4 was developed, the continued growth of the internet created the need for additional addressing capacity.
What Is IPv6?
IPv6 stands for Internet Protocol version 6.
It uses a 128-bit address system, providing a vastly larger address space than IPv4.
An IPv6 address is normally written using hexadecimal characters separated by colons.
For example:
2001:db8::1
IPv6 was designed to provide enough addresses for the continued expansion of the internet and connected networks.
IPv4 vs IPv6 at a Glance
| Feature | IPv4 | IPv6 |
|---|---|---|
| Protocol version | Version 4 | Version 6 |
| Address size | 32 bits | 128 bits |
| Address format | Decimal | Hexadecimal |
| Example | 192.0.2.1 | 2001:db8::1 |
| Address space | About 4.3 billion addresses | Extremely large address space |
| Broadcast | Supported | No traditional broadcast |
| Address configuration | Manual or DHCP | Supports automatic configuration mechanisms |
| Current deployment | Very widespread | Increasingly deployed |
Why Was IPv6 Created?
One of the major reasons for developing IPv6 was the limited number of IPv4 addresses.
The internet expanded far beyond the scale originally anticipated. More computers, smartphones, servers, network equipment, and connected devices required IP addresses.
Technologies such as Network Address Translation (NAT) helped extend the usefulness of IPv4, but they do not eliminate the underlying limitation of the IPv4 address space.
IPv6 provides a vastly larger number of addresses.
IPv4 Address Format
An IPv4 address contains four decimal sections.
For example:
203.0.113.25
Each section represents 8 bits, giving IPv4 a total of 32 bits.
IPv4 addresses are commonly written in decimal notation because it is easier for people to read than a binary representation.
IPv6 Address Format
IPv6 addresses contain eight groups of hexadecimal values.
A full IPv6 address can look like:
2001:0db8:0000:0000:0000:ff00:0042:8329
IPv6 allows certain zeros to be omitted to make addresses shorter.
The example above can therefore be represented in compressed form as:
2001:db8::ff00:42:8329
The double colon represents one or more consecutive groups of zeros.
Does IPv6 Replace IPv4 Immediately?
No.
The transition from IPv4 to IPv6 has been gradual.
Both protocols continue to be used across the internet, and networks can use different transition and coexistence technologies.
Some networks support both IPv4 and IPv6. This is commonly referred to as dual-stack operation.
What Is Dual Stack?
Dual stack means that a device or network can communicate using both IPv4 and IPv6.
For example, a computer may receive both an IPv4 address and an IPv6 address and use the appropriate protocol depending on the destination and network configuration.
Dual-stack deployment allows organizations to introduce IPv6 while continuing to support services that still rely on IPv4.
Is IPv6 Faster Than IPv4?
IPv6 is not automatically faster simply because it is a newer protocol.
Actual connection performance depends on many factors, including:
- Network routing
- Internet provider
- Server location
- Network congestion
- Peering arrangements
- Device configuration
- Transport protocols
- The destination service
In some situations IPv6 can provide a more direct path, while in others IPv4 may perform similarly or differently.
The protocol version alone does not determine internet speed.
Is IPv6 More Secure Than IPv4?
IPv6 was designed with modern networking requirements in mind and includes capabilities that support secure network communication.
However, using IPv6 does not automatically make an internet connection secure.
Security still depends on factors such as:
- Firewall configuration
- Operating system security
- Applications
- Network policies
- Encryption
- Authentication
- Proper device configuration
Both IPv4 and IPv6 networks require appropriate security practices.
Do I Need IPv6?
For most users, IPv6 support is determined largely by their internet provider, router, operating system, and the websites or services they access.
Modern operating systems and networking equipment commonly support IPv6.
You do not necessarily need to manually configure IPv6 unless your network or service requires it.
How Can I Tell Whether I Am Using IPv4 or IPv6?
You can use the TechEssentials IP address tool to check the public IP address detected for your current connection.
If the address is displayed in the familiar four-number format separated by periods, it is an IPv4 address.
If it uses hexadecimal characters separated by colons, it is an IPv6 address.
Frequently Asked Questions
Which has more addresses, IPv4 or IPv6?
IPv6 has a vastly larger address space because it uses 128-bit addresses compared with 32-bit addresses in IPv4.
Can IPv4 and IPv6 work together?
Yes. Networks can support both protocols simultaneously through technologies such as dual-stack operation.
Does IPv6 make my internet faster?
Not necessarily. Internet performance depends on routing, network conditions, servers, providers, and many other factors.
Can I use IPv6 without IPv4?
It is technically possible for networks and services to operate using IPv6 only, but many internet environments still support IPv4, and compatibility requirements vary.
Why does my device sometimes show both IPv4 and IPv6?
A device can have both types of addresses when its network supports dual-stack connectivity. This is normal on many modern networks.
Conclusion
IPv4 and IPv6 are both important parts of internet networking.
IPv4 remains widely used, while IPv6 provides a much larger address space designed to support the continued expansion of connected devices and networks.
Understanding the difference between the two can help you interpret network information and better understand how your internet connection works.
To check which IP version your current connection uses, visit the TechEssentials IP address tool.
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