• Post published:July 15, 2019
  • Post Comments:0 Comments

IPv4 vs IPv6 - What’s the DifferenceHave you ever wondered about the IP address assigned to you by your ISP? Where it has been generated or how it has been distributed among the users?

Well, in this article we will clear the understanding behind IP address generation and distribution. To understand the overall workflow, first, you will need to understand two terminologies IPv4 and IPv6. So what is the difference between IPv4 vs IPv6?

Let’s get acquainted with the better understanding of these protocols.

What is IPv4?

Internet Protocol version 4 (IPv4) is a technology which allows devices to connect to the internet. Whenever devices access the internet, it is assigned a particular IP address such as 99.87.542.223.

To send and receive data from one computer to the other, the network uses data packets which are transferred across the network of both devices.

Without IP addresses, computers cannot communicate and send and receive data to one another. It is an essential aspect of the infrastructure of the web.

What is IPv6?

IPv6 stands for Internet Protocol version 6. It is a successor to IPv4. The functionality of both IPv6 and IPv4 are more or less similar to one another; however, the latest successor has a few added benefits and changes. Both of the internet protocols share the same grounds at giving a unique IP address and enabling internet devices to communicate with one another, However they differ in many aspects in which one is that IPv6 uses 128bit, while IPv4 uses 32bit.

Are IPv4 Addresses Depleting?

As mentioned above IPv4 uses 32bits for internet address which means that it can only support around 4.29 billion IP addresses in total. The number in billions does sound many, but they are assigned to different institutions which have led to the crisis we are facing today.

Let’s be more specific; we haven’t run out of the addresses just as yet. Many of the IP Addresses are still unused and are under the hands of institutions like MIT and companies like IBM and Ford. Since IPv4 are a scarce source, they are now only traded and sold, and with years to come, they will become further scarce and might create problems for the web.

Does IPv6 Solve this Problem?

A: Since IPv6 uses 128-bit IP addresses so it can support 330,282,366,929,938,000,000,000,000,000,000,000,000 internet addresses.

These are a lot of addresses so many that it requires a hexadecimal system to display the addresses. IPv6 thus solves the problem which IPv4 couldn’t handle in such a way that it can keep the internet devices connected with the web for a long time.

Have You Switch to IPv6 Already?

It was predicted years ago that IPv4 addresses would deplete in coming years and struggle was in process to make an alternative. However, the progress has been small, and only a small fraction of the web ash switched over to the new protocol. IPv4 and IPv6 also act as parallel networks and exchange the data between these protocols. To make these two protocols work together, software and routers need advance network configurations.

Another reason why IPv4 has been replaced by IPv6 IP address is the vulnerability attached with IPv4. In most cases breaches happen because the IP address is leaked in the open internet, especially when connected with a VPN. You can easily check if your IP is leaking while connected with VPN in easy steps.

Will it affect you?

Initially the switch towards IPv6 won’t affect your life since most operating systems are compatible with it. However, IPv6 has been reported to have a lot of bugs which can be a real mess; gladly experts are working on it.

Let’s talk about their features!

Features of IPv4

Ipv4 has the following features;

  • Consumes less memory
  • Ease of remembering
  • Supported by millions of devices.
  • Allows simple communication layer over diversified devices.

Features of IPv6

IPv6 has the following features;

  • Stateless configurations.
  • Perfect internet protocol for neighboring node interaction
  • Hierarchy addressing
  • Routing infrastructure
  • Support for QoS (Quality of Service)

IPv4 vs IPv6 Comparison

Features IPv4 IPv6
Address Length Has address length of 32-bit Has address length of 128-bit.
Security IPv4 security depends on the application. IPv6 depends on IPSec which is an inbuilt security feature.
Address Representation Address representation is in decimal. Address representation is in hexadecimal.
Transmission Scheme It has a broadcast message transmission scheme which is very different to IPv6. It offers multicast and has cast message transmission.
Encryption Authentication and encryption facility is not available. Authentication is available.
Routing Information Protocol Supported by Routed Daemon Not supported on IPv6 and uses static routes.
Type of Address Unicast, Broadcast, and multicast Unicast, multicast, and anycast
Number if classes Offers five different classes of IP address. Class A to E Stores unlimited IP Address
Packet flow Identification In IPv4 Packet flow identification is not available IPv6 uses packet flow identification and also uses field label in header.
Packet Size 576 bytes required and fragmentation is optional 1208 bytes required no fragmentation.
DNS Records  Address (A) records and maps hostnames Address (AAAA) records and maps hostnames
IPSec (Internet Protocol Security) Optional Mandatory
Mapping Uses ARP (Address Resolution Protocol) for Mac Address Uses NDP (Neighbor Resolution Protocol) for Mac Address
Compatibility Across Devices Not suitable for mobile networks because it uses dot-decimal notation. Best suited to mobile and other platforms because of its hexadecimal and colon-separated notation.

Benefits of IPv6

People found quarreling over internet protocols, but little do they know that IPv6 and IPv4 have different benefits.

The IPv6 technology is an improved version of IPv4; let’s have a look at what it brings.

  • Simplified and more efficient routing
  • Auto-Configuration
  • No more Network Address Translation
  • Flexible extensions and options
  • Built-in authentication for privacy support
  • Better multicast routing
  • No more private address collisions
  • Say goodbye to DHCP, IPv6 has a simpler administration

How to Enable or Disable IPv6 on MacOS?

  1. Click the Apple icon and go to system preferences
  2. Click Network and select advanced
  3. Select TCP/IP tab
  4. Click next and configure IPv6
  5. Select your preferred settings, and you’re good to go.


You must rely on IPv6 as it is a newer, much advanced and better technology.

But hold on!

If it is better than IPv4 then why not use it by default?

There are a few issues with IPv6, but we are hoping to have them sorted. Although one ache for VPN users is that many VPN providers do not offer IPv6 leak protection yet, so either they have to switch to the previous version (IPv4), or they have to opt for a different VPN provider that offers protection against IPv6 leaks.

Terry Higgins

Terry Higgins is a Digital Content Writer at allbestVPN.com, who specializes in security and technology. He has ample experience in cybersecurity having a background of Computer Sciences.

Leave a Reply