What Is IPv6 (Internet Protocol Version 6)?

Key takeaways

• IPv6 is a newer internet protocol update, offering improvements over the previous version, IPv4.

• An IPv6 address is 128 bits long, which enables 340 undecillion unique addresses.

• Many internet service providers have started transitioning to IPv6, but the process is ongoing.

Benefits of IPv6 include a simpler, more efficient header and built-in security support. Learn more about IPv6 and the benefits it has to offer in this article. Then consider earning a Google IT Support Professional Certificate, where you will have the opportunity to build job-ready skills in areas such as operating system administration, computer networking, IT security architecture, and more.

What is IPv6?

IPv6 is the latest internet protocol that overcomes the lack of IPv4 addresses and provides a larger address space to accommodate the growing number of internet-connected devices. It offers many improvements and additional features that generally advance internet communication. However, since the intention of previously built infrastructure was compatibility with IPv4, updating to IPv6 is both costly and challenging, yet adoption continues to grow as businesses and organizations look to experience the benefits of this more modern internet infrastructure.

What is an IPv6 address?

IPv6 addresses are 128 bits long, represented as eight groups of four hexadecimal digits separated by colons, such as 2001: 0db8: 85a3: 0000: 0000: 8a2e: 0370: 7334. Bits are binary digits that are the smallest units of data on a computer. The expanded address space of IPv6 allows for approximately 340 undecillion (3.4 x 10^38) unique addresses, ensuring that every device can have a globally unique identifier.

IPv6 benefits

The increased address space in IPv6 eliminates the need for techniques like network address translation (NAT), which are commonly used in IPv4 to conserve address space. NAT allows multiple devices to share a single public IP address, but it introduces complexity and can cause issues with certain applications. With IPv6, each device has its own public IP address, simplifying network configurations and facilitating direct end-to-end communication. The additional benefits that IPv6 offers include:

• Simpler, more efficient header: IPv6 uses a simpler and more efficient header than the IPv4 header, resulting in faster routing and improved network performance. It also supports more efficient packet handling, eliminating the need for header checksums at every intermediate hop.

• Built-in support for security: IPv6 introduces built-in support for security through internet protocol security (IPsec). IPsec provides encryption and authentication at the network layer, ensuring secure communication between devices. While IPsec was optional in IPv4, it is an integral part of IPv6, enhancing privacy and data integrity across the internet.

• Supports mobility and auto-configuration: IPv6 incorporates features that support mobility and auto-configuration. Devices on Mobile IPv6 can move between different networks without losing connectivity, enabling uninterrupted communication while on the move.

• Stateless address auto-configuration: IPv6 also includes stateless address auto-configuration (SLAAC), which allows devices to generate their own IPv6 addresses and obtain necessary network information without relying on external configuration servers.

Transitioning to IPv6

The transition from IPv4 to IPv6 is an ongoing process. Many organizations and internet service providers (ISPs) have started deploying IPv6 infrastructure to ensure compatibility and future-proof their networks. However, complete IPv6 adoption requires the cooperation and support of all network stakeholders, including internet service providers, hardware manufacturers, software developers, and end-users.

Learn more: Understanding IPv4 vs. IPv6

Who uses IPv6 the most?

As of November 2026, France holds the highest global IPv6 adoption rate, with 86.31 percent of its internet traffic using IPv6, according to Google [1]. Russia, Germany, India, and Saudi Arabia are also leading the way in IPv6 adoption, driven by their expanding internet infrastructures [1].

IPv6 example

IPv6 addresses are in hexadecimal notation and divided into eight groups of four hexadecimal digits separated by colons. Each group represents 16 bits, resulting in a total of 32 characters in the address. It doesn’t need leading zeros within each group, and you can compress consecutive groups of zeros by using a double colon (::), but this abbreviation can only be used once in an address.

For example, consider the following sample IPv6 address: 2001: 0db8: 85a3: 0000: 0000: 8a2e: 0370: 7334. In this address, each group of four hexadecimal digits represents 16 bits. The leading zeros within each group are not necessary, resulting in the address 2001: db8: 85a3: 0: 0: 8a2e: 370: 7334. Additionally, a double colon (::) can replace consecutive groups of zeros, but only once. Thus, the address can be further abbreviated as 2001: db8: 85a3:: 8a2e: 370: 7334.

Related terms

• CPU

• BIOS

• CIDR

• TCP/IP

• Operating system

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