IPv4 vs IPv6 – What’s the Difference and Which Is Better?

The Internet Protocol (IP)one of the most important communication protocols in the Internet Protocol Suite (IPS) addresses and routes packets for networking devices such as computers, laptops, and fiber switches over a single network or a network collection of interconnected networks. The two current iterations of the Internet Protocol are IPv4 (IP version 4) and IPv6 (IP version 6). What do IPv4 and IPv6 mean? Which is quicker, working or playing a game? I'm hoping reading this blog will help you get there.

What Is IPv4?

The IPv4 version of the Internet Protocol (IP) was created in order to be utilized on packet-switched networks like the Internet. It is an internet protocol for communication. Since the beginning of the Internet, it has been the Internet Protocol variation that is most frequently used.

To identify devices on a network, IPv4 employs a 32-bit address system with a maximum address capacity of 4.3 billion addresses. The IPv4 address supply is exhausted due to the expansion of the internet and the rise in the number of devices connecting to it.

Both a header and a payload are present in IPv4 packets. Along with other data used for routing and error detection, the header includes information like the source and destination addresses. The actual data being transferred such as an email message or a web page is contained in the payload.

Features of IPv4

The network layer protocol known as IPv4 (Internet Protocol version 4) is widely used in computer networking. IPv4 has a number of features, including.

32-bit address space: Since IPv4 uses a 32-bit address space, there are only 4.3 billion possible unique addresses that can be assigned to devices on a network.

Datagram packet delivery: Since IPv4 uses datagram packet delivery, each packet is handled separately and routed to its destination.

Header format: The header format of IPv4 contains a number of fields, including source and destination IP addresses, protocol details, and checksum.

Fragmentation: Since IPv4 supports packet fragmentation, large packets can be divided into smaller packets and delivered over a network.

Limited security features: There are no security measures built into IPv4 although security can be introduced using other protocols like IPsec.

What Is IPv6?

The most recent version of the Internet Protocol (IP), which controls how data is carried across the internet, is IPv6 (Internet Protocol version 6). The restrictions of IPv4, the IP version before it, were addressed with IPv6.

Given the exponential increase in the number of internet-connected devices, IPv6 is intended to offer a much larger pool of IP addresses. Since IPv6 employs 128-bit addresses, it can support roughly 340 undecillion (3.4 x 1038) different IP addresses.

Along with a wider address space, IPv6 also offers enhanced multicast capability, more effective routing, and more powerful security features. Although IPv6 has been around for some time, adoption has been a little slower due to the need to modify end-user devices and network infrastructure. But as the need for IP addresses rises, more IPv6 will probably be used in the coming years.

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Features of IPv6

The IPv6 protocol, which will replace IPv4, does not provide backward compatibility. While attempting to preserve the essential IP addressing functionality, IPv6 is completely rewritten. It offers the following qualities

Larger Address Space

IPv6 uses four times as many bits to address a device on the Internet as IPv4. This many extra bits can produce about 3.4 1038 different address combinations. This address is able to meet practically every aggressive address allocation need in the globe. Every square meter of this planet can reportedly accommodate 1564 addresses.

Simplified Header 

The IPv6 header has been made simpler by shifting all extra data and options (found in the IPv4 header) to the end of the header. Given that the IPv6 address is four times longer than the IPv4 address the IPv6 header is only twice as large.

End-to-end connectivity 

Every system now has a distinct IP address and is capable of using the Internet without the use of NAT or other interpreting devices. Every host will be able to directly connect to other hosts on the Internet once IPv6 is completely implemented with some restrictions such as firewalls and organizational regulations.


Both stateful and stateless auto-setup modes of host devices are supported by IPv6. In this method, communication between segments is not hampered by the lack of a DHCP server.

Faster Forwarding/Routing

All extra information is placed at the end of a simplified header. The first section of the header's information is sufficient for a Router to make routing decisions allowing it to do so more quickly than by consulting the obligatory header.

Differences Between IPv4 and IPv6

The Internet Protocol, which is in charge of directing data packets through the Internet comes in both IPv4 and IPv6 versions. Following are the key distinctions between IPv4 and IPv6.

Address space

Only 4.3 billion unique addresses are available in IPv4 due to the use of 32-bit addresses. However, IPv6 uses 128-bit addresses giving users access to almost an infinite number of unique addresses.

Address format

IPv6 addresses are represented in hexadecimal format with colons such as 2001:0db8:85a3:0000:0000:8a2e:0370:7334, while IPv4 addresses are represented in dotted decimal format, such as


In contrast to IPv4 which lacks encryption and authentication by default, IPv6 comes with built-in security mechanisms like IPsec.


Stateless address auto configuration and multicast support are two characteristics of IPv6 that increase the effectiveness of data transport.


Despite the fact that IPv4 and IPv6 are not directly compatible, they can coexist thanks to transitional mechanisms. Dual-stack is one such method, which makes use of the same network infrastructure to operate IPv4 and IPv6.

IPv4 and IPv6, which is better?

While both IPv4 and IPv6 are important internet protocols, due to some differences sometimes one may be preferred over the other depending on the circumstance. There are 4.3 billion possible unique addresses in the older IPv4 protocol, which uses 32-bit addresses.

This might sound like a lot, but it's estimated that the world has already used up about 90% of the IPv4 addresses available, making it difficult for new devices to connect to the internet.

In comparison, IPv6 addresses are 128 bits long, allowing for virtually infinite numbers of distinct addresses. As a result, it can be used to construct networks with a wider variety of devices and more complexity while also being more resistant to technological improvements.

In addition to a greater address space than IPv4, IPv6 promises improved security and easier network administration. Given that IPv6 has not yet gained as much traction as IPv4, some networks and devices may not work with it. Due to its greater address space and other advantages, IPv6 is frequently seen as the better protocol for the internet's future. IPv4 is still extensively used and works with more devices though.


When you need the best routing performance for your unique network application, IP version 6 is recommended. Due to IPv6's practically limitless address space, each device on your network can have a distinct public IP address. However, IPv4 and IPv6 are initially incompatible. To make sure the two protocols are functional and compatible, intermediary technology is required. At the moment, IPv4 rules the public internet and is frequently utilized for tasks like hosting server clusters and dedicated servers. Contact Server Colocation UK to go over your particular hosting and application requirements.

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