Written by 9:22 am DNS, Internet

What is an IPv6 address? [Fully explained]


IPv6 represents the newer generation of technology and development. The older version of IP – IPv4 is still very popular, but its shortage is a common issue. So, at some time in the future, we should let it go. Therefore, it is essential to understand the newer version of IP – IPv6. So, let’s explain a little bit more about it!

IPv6 – What does it mean, and what is it used for?

IPv6 stands for Internet Protocol version 6, and it is the newer version of the Internet Protocol (IP). Yet, can you imagine it was around for more than 20 years? It was introduced back in December 1995! The main goal for its creation is to take over and eventually replace the previous protocol – IPv4. The reason is simple. The number of devices that want to connect to the Internet is growing tremendously, and IPv4 is not able to satisfy such needs. 

The IPv6 is a network layer protocol that allows communication and data transfer between two different hosts. It sets specific rules that help identify the separate hosts and track their location. That way, they could exchange information successfully. Only when the two corresponding IP addresses are identified, the route could be established, and the hosts are able to communicate.

IPv4 protocol, the previous standard, allows 4.2 billion unique IP addresses. However, with the newer tech developments and the various new wireless and network-attached devices, such as the IoT devices, it was predicted that by 2010, the Internet would have exhausted all unique IPv4 addresses.

On the other hand, thanks to the standardization of the new IPv6, it allows 3.4 x 1038 unique IP addresses. This is equal to 340 trillion trillion trillion IP addresses.

IPv6 operates with 128-bit addresses. Each address includes eight different groups of strings, and every group has four characters (alphanumeric), divided by a colon. Thanks to these characteristics, it is able to provide an incredible amount of unique IP addresses. That guarantees that we should have available unique IP addresses to assign to all of the new devices for a very long time.

How does the Internet work? 

The Internet is a pretty extensive cable network. It connects numerous data centers placed all over the world and the users that desire to reach and connect with their services. All of the network points are connected with massive cables.

Additionally, such a large network of interconnected machines and devices requires proper order and the ability to identify all of the different devices with their associated addresses. Therefore, both users and servers should have an IP address for that purpose. Moreover, the servers hold hostnames, too. 

When a user wants to view a particular website, it has to type its domain name (hostname) and connect to the web server that holds the information for it. Every website on the Internet is hosted on web servers in different data centers. That way, you can access websites, applications, and services.

IP address – definition

The IP address serves as an ID and identifies all of the various hosts on the network – both servers and users. There are two main types of IP addresses:

Private: This type of IP address is used when users connect on a closed private network. Thanks to it, the user gains access to the specific network, and it is able to communicate with the other devices, which it includes.

Public: This type of IP address is used when you want to connect to the Internet. Usually, an Internet service provider (ISP) provides you with a router that you need and a public IP address. Servers need such an address too, and it should not change, meaning they should be static.

You are probably wondering why we are talking about IP addresses. In reality, to access a website, we just type domain names. So, let’s find out more!

Domain Name System explained

The Domain Name System (DNS) is a global database that contains all of the existing domain names and their IP addresses. It answers the DNS queries of the users for the domain names and their IP addresses daily.

The Domain Name System is decentralized and built in a hierarchical order. Therefore, each level knows the answer for the one below. On the top level are the Root servers, which provide information about the TLD (Top-Level Domain) servers. In addition, they hold data about where the different extensions are, such as .com, .info, .net, etc.

Thanks to this arrangement, it is easy for users to type the domain name and reach the website. The user requests the needed IP address (IPv4 or IPv6), and it first checks the DNS cache of the device. If it’s not available there, the recursive DNS server performs the next step. It searches for the answer until it reaches the authoritative DNS server that holds the needed information (A record or AAAA record). This whole process is also known as DNS resolution.

IPv4 vs. IPv6 – differences

The main contrast between IPv4 and IPv6 is in the increased number of addresses. The IPv4 is a 32-bit IP address, and IPv6 is a 128-bit IP address. Yet, IPv4 is still a popular choice compared to IPv6.

Additional differences between IPv4 and IPv6 are:

  • IPv6 relies on an alphanumeric addressing technique. On the other hand, IPv4 is based only on numeric.
  • The bits in IPv6 are divided by a colon. The bits in IPv4 are divided by a period.
  • IP security is demanded by IPv6, while in IPv4, it is an option.
  • IPv6 implements an IP security (IPSec) protocol. On the other hand, IPv4 leans on applications.
  • With IPv6, networks are automatically configured. On the other hand, networks based on IPv4 should be configured via Dynamic Host Configuration Protocol (DHCP) or manually.
  • IPv6 uses NDP (Neighbor Discovery Protocol) for mapping MAC addresses, and IPv4 operates with ARP (address resolution protocol).
  • IPv6 holds eight header fields with a length of 40-characters. IPv4 holds 14 header fields with a length of eight characters.
  • IPv6 does not include any checksum fields.

How to check my IPv6 address?

Checking your IPv6 address is a simple task. There are several ways you could see it. 

Via your browser: 

You are able to check your external IPv6 address by simply writing “What is my IP” on Google.com. You are going to receive the regular search results, plus a rich snippet with the information you need. So, simple and easy, right!

If you are a Windows user:

In this case, you should simply open the Command Prompt. Then, type the following:  “ipconfig”. You will receive as an answer the entire IP configuration.

If you are a Linux user:

In this case, you should simply open the Terminal and then type the following: “ip addr”. Next, you should find “inet”, and you are going to notice your IPv6 address.

If you are a macOS user:

In this case, click the Apple icon on your top left corner. Then click on “System Preferences” and find and click on “Network”. Lastly, search for the network connection that you use and click on it. There you are going to see your IPv6 address. Easy, right?

Advantages and disadvantages 

Advantages of IPv6

  • It increases the capacity of address space – That way, the different resources are efficiently distributed to the adapted additional web addresses.
  • Routing is efficient – It gives a possibility of easy aggregation of prefixes assigned to IP networks.
  • Efficient Data Flow – It allows the transfer of large data packets simultaneously. That helps with preserving bandwidth.
  • Security– It improves safety and security based on the improved authentication methods built into network firewalls.

Disadvantages of IPv6

  • Slow adaptation: It is based on the fact that IPv4 is still very popular, and a large part of users are using it. The transition to the newer IPv6 is a slow process.
  • Connection: IPv4 and IPv6 devices are not able to communicate directly. Yet, there are very few occasions that they would need to.
  • Readability: Operating and learning IPv6 subnetting can be complicated on its own. Additionally, if you just think about remembering or memorizing your IPv6 address seems like a difficult task.

Suggested article: IPv4 vs IPv6 and where did IPv5 go?


There is no doubt that IPv6 is beneficial, and it is considered a revolutionary technology. However, it is going to take some time until we fully commit and use its real potential.

(Visited 2,814 times, 34 visits today)
Enjoy this article? Don't forget to share.
Tags: , , , , , Last modified: November 15, 2022