What is an IP address and what is its function?
For network devices to communicate with one another within an IP network, they require an IP address. It is used to address devices and enables data packets to be routed to the correct sender and recipient. Without it, no data exchange would be possible between server and client, or between different locations or services.
An IP address works in a similar way to a postal address. It ensures that information reaches the correct destination device. An IP address can be either static (permanently assigned) or dynamic (automatically assigned and subject to change).
Fixed IP addresses are often used, particularly in the business sector, as constant IP addresses are easier to integrate into firewall rules, VPN configurations and other network set-ups. A distinction is made between two IP versions: IPv4 and IPv6.
IPv4 – the established standard with limited address space
IPv4 stands for Internet Protocol Version 4 and was introduced as early as 1981. The protocol is based on 32 bits, which theoretically allows for around 4.3 billion unique addresses. Given the sharp global increase in internet-enabled devices, the available public IPv4 address space is now largely exhausted.
A typical IPv4 address looks like this: 192.168.1.1
IPv4 is still in use today and is widely used in corporate networks, private networks and for internet access.
Network Address Translation (NAT) allows several devices with private IPv4 addresses to share a single public IPv4 address. This reduces the demand for public IPv4 addresses. However, NAT increases complexity and can result in additional configuration work, particularly in the case of direct end-to-end communication, VPN connections or incoming connections.
IPv6 – The future-proof standard for modern corporate networks
IPv6 was developed as the successor to IPv4 and is based on 128 bits. This version of IP offers around 340 sextillion IP addresses (2¹²⁸ ≈ 3.4 × 10³⁸), a number with 36 zeros. This enormous address space enables very generous and long-term scalable addressing of networks and end devices.
An example IPv6 address format looks like this: 2001:0db8:85a3:0000:0000:8a2e:0370:7334
IPv6 – advantages at a glance:
- Significantly larger address space
- More efficient routing of data packets
- No mandatory requirement for NAT
- Simplified automatic address configuration, for example via SLAAC (Stateless Address Autoconfiguration)
- IPsec support is included in the IPv6 specification
IPv6 is the more future-proof choice, particularly in growing corporate networks, for IoT applications and when connecting to modern cloud infrastructures. Providers, data centres and internationally active companies are also increasingly adopting IPv6 as the standard.
An overview of the differences between IPv4 and IPv6
IPv4 and IPv6 share the same objective: the unique addressing and communication of devices on networks. Nevertheless, the two protocols differ significantly in terms of address space, scalability, security and technical implementation.
The following overview highlights the key differences at a glance.
| Characteristic | IPv4 | IPv6 |
|---|---|---|
| Address length | 32-bit | 128-bit |
| Address space | approx. 4.3 billion | approx. 340 sextillion |
| Notation | Decimal, e.g. 192.168.0.1 | Hexadecimal, e.g. 2001:0db8::1 |
| NAT | Usually required (address scarcity) | Generally not necessary |
| Autoconfiguration | Limited, usually via DHCP | Supported by SLAAC |
| Security (IPsec) | Can be added as an option | Included as standard; configuration remains crucial |
Speed, security and similarities between the two protocols?
Is IPv6 automatically faster than IPv4?
Not necessarily. The actual speed depends on the network environment, the provider, the hardware used and the applications.
However, under certain conditions, IPv6 can offer performance benefits:
- no mandatory need for NAT
- more efficient routing
- more direct end-to-end communication without the mandatory use of NAT
- better scalability for large infrastructures
Companies with cloud applications, international locations or many networked devices in particular can benefit from an IPv6-enabled infrastructure.
For businesses, it is important to note that IPv6 should not be viewed solely as a means of optimising speed. The greatest advantage lies in a future-proof network architecture with better scalability.
What both protocols have in common
Despite their technical differences, IPv4 and IPv6 fulfil the same fundamental purpose: both protocols enable communication between devices on networks and ensure that data packets reach their correct destination.
Both protocols can be used with modern network components such as routers, firewalls and servers, and are a key component of any IT infrastructure. Basic network functions such as routing, the transmission of data packets and the connection of end devices are also based on similar principles in both standards.
For businesses, this means that a switch from IPv4 to IPv6 does not alter the fundamental way a network operates, but primarily expands the technical possibilities in terms of scalability and address management.
When is it worth switching to IPv6 in a corporate network?
Switching to IPv6 is not absolutely essential in every case. Smaller businesses with a manageable network infrastructure can continue to use IPv4 for the time being, particularly as many existing systems are still designed for it and a switch would involve significant effort.
When procuring new equipment and applications, however, IPv6 compatibility is recommended as a selection criterion. IPv6 should also be taken into account from the outset when planning new sites or setting up cloud and remote access solutions. A common transitional approach is the parallel operation of both protocols, known as dual stack.
| Situation within the organisation | Recommendation | Reason |
|---|---|---|
| Small environment, existing IPv4 infrastructure | Continue using IPv4, plan for IPv6 | An immedih iate switcs usually not necessary. IPv4 continues to function reliably and the transition may incur additional costs. |
| New network devices, servers or firewalls are being purchased | Specify IPv6 compatibility as a selection criterion | New hardware should be future-proof and support IPv6, even if IPv4 is still in use at present. |
| Setting up a new site or network structure | Take IPv6 into account from the outset | Modern standards are easier to integrate during the planning stage than when retrofitting at a later date. |
| Introducing new cloud services or remote access solutions | Check for IPv6 capability | Modern digital services are increasingly relying on IPv6 support. Planning at an early stage prevents the need for adjustments later on. |
| Existing applications or devices only support IPv4 | Implement dual stack | The parallel operation of IPv4 and IPv6 enables a phased migration without disrupting existing processes. |
| Rapidly growing companies with many devices, sites or IoT applications | Plan IPv6 migration strategically | The larger address space of IPv6 offers better scalability in the long term and reduces technical limitations. |
| Companies without specific growth or modernisation plans | Continue operating IPv4 and draw up an IPv6 roadmap | An immediate switch is not strictly necessary, but future decisions should take IPv6 into account. |
Challenges in the roll-out and use of IPv6
Despite the technical advantages, the path to widespread use of IPv6 is fraught with various hurdles. Many organisations are still reluctant to make the full switch. There are many reasons for this:
- Compatibility with existing infrastructure: Many older devices and applications are not IPv6-compatible
- Training requirements: IT teams need to familiarise themselves with new protocol mechanisms and configurations
- Complexity of troubleshooting: Analysing IPv6 addresses is more labour-intensive
- Administrative overhead in mixed-mode operation (dual stack): Running IPv4 and IPv6 in parallel requires additional effort
- Security considerations: New features introduce potential attack vectors if not implemented correctly
A structured migration plan is therefore advisable for the transition from IPv4 to IPv6, in order to avoid risks and allocate resources effectively.
Prospects – What does the future hold for IPv6?
Although IPv4 is not set to disappear just yet, the long-term outlook clearly lies with IPv6. The ever-increasing number of connected devices and the trend towards cloud solutions require scalable and stable network architectures.
- Internet service providers and hosting providers are increasingly expanding their IPv6 support.
- IPv6 offers advantages, particularly for large IoT environments, thanks to its extensive address space and scalability.
- IPv4 addresses are becoming increasingly expensive and harder to obtain
For businesses, early IPv6 planning can reduce dependence on scarce IPv4 addresses and improve the scalability of future network architectures.
Conclusion – IPv6 is more than just a technical upgrade
The choice between IPv4 and IPv6 depends on your requirements, your existing infrastructure and your future growth plans. IPv4 will remain relevant for the foreseeable future – however, IPv6 is increasingly becoming the standard for modern network architectures.
Anyone planning new network components or looking to expand existing structures should ensure they are IPv6-compatible. Careful planning and modern hardware ensure flexibility and future-proofing.
Network consultancy and suitable hardware at it-market
At it-market, you’ll find a wide selection of IPv4- and IPv6-compatible routers, switches and security components, available as new or refurbished items with up to a 3-year warranty for businesses.
Our sales team will be happy to assist you with planning, expanding or modernising your network infrastructure, tailored to your individual requirements.
Do you have any questions about the IPv6 transition, need compatible hardware or would like some no-obligation advice? Please get in touch with us by phone, email or via our online form. Together, we’ll find the right solution for your network.
FAQ: Frequently asked questions about IPv4 vs. IPv6
What is the difference between IPv4 and IPv6?
The most important difference lies in the available address space. IPv4 offers around 4.3 billion addresses, whilst IPv6 provides a virtually unlimited address space. In addition, IPv6 improves various areas such as automatic configuration and modern network architectures.Does a business have to switch to IPv6?
An immediate switch to IPv6 is not absolutely essential for every business. Existing IPv4 networks can continue to be operated. However, businesses should take IPv6 into account for new projects, the purchase of new hardware, and cloud and network modernisation.Can IPv4 still be used?
Yes, IPv4 will continue to be used in the long term. Many companies and internet services still rely on IPv4. Often, IPv4 and IPv6 are run in parallel (dual stack) to enable a gradual transition.What does ‘dual stack’ mean in the context of IPv4 and IPv6?
Dual stack refers to the parallel operation of IPv4 and IPv6 within a network. Devices can communicate using both an IPv4 and an IPv6 address. This method enables companies to migrate gradually without having to replace existing systems immediately.Is IPv6 more secure than IPv4?
Not necessarily. Whilst IPv6 does incorporate IPsec into the protocol standard, its use is not mandatory, and IPv4 can also be secured with IPsec without any problems. Ultimately, it is not the protocol that determines a network’s security, but its configuration: well-defined firewall rules, clearly defined access rights, ongoing monitoring and well-thought-out security policies.What are the benefits of IPv6 for businesses?
IPv6 offers businesses, above all:
- a significantly larger address space
- better scalability for growing networks
- less reliance on NAT
- well-suited to large cloud, data centre and IoT environments
- a network architecture that is scalable in the long term
What are the disadvantages of IPv6 for businesses?
The biggest challenges with IPv6 lie in its implementation:
- Adapting existing network infrastructure
- Potential compatibility issues with older systems
- Additional training requirements for IT staff
- Increased workload during parallel IPv4/IPv6 operation
- Higher additional costs for planning, migration, training and hardware
What happens if companies do not adopt IPv6?
In the short term, many companies will not face any direct problems. In the long term, however, an IPv4-only infrastructure may impose limitations on new technologies, cloud services and rapidly expanding networks.Which is faster: IPv6 or IPv4?
IPv6 is not inherently faster than IPv4. The actual speed depends on the network, provider, routing and applications. In modern environments, IPv6 can offer advantages thanks to more efficient network structures.How many IPv4 addresses are there?
IPv4 has a theoretical address space of around 4.3 billion possible IP addresses. Due to the sharp increase in internet-enabled devices, the available public IPv4 address space is now largely exhausted.How many IPv6 addresses are there?
IPv6 uses 128-bit addresses and allows for approximately 340 sextillion unique addresses (3.4 × 10³⁸).What is the IP protection rating?
The IP protection rating describes a device’s protection against dust, water and foreign objects. It is often confused with an IP address, but has nothing to do with network connections.Whilst an IP address identifies a device on a network, the IP protection rating provides information about a product’s physical resilience – which is relevant, for example, in outdoor or industrial applications.