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What IPv6 means
IPv6 stands for Internet Protocol version 6. It is the evolution of the IP protocol designed to solve the limit on available addresses that gradually appeared with IPv4.
Just like IPv4, its main job is to give each device a unique address so it can identify itself and communicate inside a network or across the Internet.
Key idea: IPv6 does the same basic job as IPv4, but with a vastly larger address catalog.
What IPv6 is used for
IPv6 is used to identify devices and allow communication between them on modern networks.
More addresses
It makes it possible to assign addresses to many more connected devices.
Modern Internet
It helps support the growth of mobile devices, connected homes, IoT, and online services.
Communication
It allows routers, phones, servers, and other devices to exchange data.
Future network base
It is designed as the long-term foundation for an Internet with more space and fewer workarounds.
If you want the general foundation before getting into versions, link strongly here: what is an IP address.
How an IPv6 address is written
An IPv6 address is much longer than an IPv4 address and combines numbers and hexadecimal letters separated by colons.
Typical examples:
- 2001:0db8:85a3:0000:0000:8a2e:0370:7334
- 2001:4860:4860::8888
- fe80::1
That length is one of its core features: there is far more address space available than in IPv4.
Why IPv6 was created
IPv6 was created because IPv4, while brilliant and still very useful, has a limited number of addresses.
With the growth of computers, phones, TVs, cameras, sensors, connected cars, and the entire digital zoo of today, a system with much more room became necessary.
IPv6 is that expansion of the map: more space, more air, more future.
Difference between IPv6 and IPv4
IPv4 and IPv6 do similar jobs, but with very different formats and capacity.
IPv4
Shorter, four dot-separated blocks, and still very common.
IPv6
Longer, uses hexadecimal and colons, with many more available addresses.
The mirror piece for this guide is: what is IPv4.
Examples of IPv6 addresses
Some IPv6 address examples:
- fe80::1 can appear on local networks as a link-local address
- 2001:4860:4860::8888 is a well-known example of a public IPv6 address
- ::1 is the loopback address in IPv6, conceptually similar to 127.0.0.1 in IPv4
If you are comparing both families, this guide also fits neatly: local IP vs public IP.
Quick summary: IPv6 is the modern version of the IP protocol. It uses much longer addresses than IPv4 and exists to support the massive growth of the Internet and connected devices.
Frequently asked questions
What is IPv6 in simple words?
It is version 6 of the Internet Protocol and it was created to provide many more available IP addresses.
Does IPv6 already replace IPv4?
Not completely. Today both protocols still coexist in many networks, services, and devices.
What does an IPv6 address look like?
It is longer than an IPv4 address and uses numbers and hexadecimal letters separated by colons.
Is IPv6 already used today?
Yes. Many ISPs, routers, phones, and Internet services already work with IPv6.
What is the main difference between IPv6 and IPv4?
IPv6 provides a much larger address space and uses a different, longer, and more modern format.