What is IPv6
IPv6 is a next-generation protocol for addressing and routing devices on data networks. Unlike its predecessor IPv4, IPv6 uses 128-bit addresses, providing an almost unlimited number of unique IP addresses for any need: corporate, carrier, or Internet of Things.
Visually, IPv6 addresses are written as eight groups of four hexadecimal characters, for example: 2001:0db8:85a3:0000:0000:8a2e:0370:7334.
The technology was created to solve the problem of address exhaustion and to enable new services that are not available in IPv4.
Addressing and Routing Features
IPv6 was built with long-term flexibility and service development in mind:
- Globally unique addresses without NAT or complex translation schemes. The protocol was originally designed for “end-to-end” connections between all points in the network.
- Extended support for mobility (Mobile IPv6) and multiple address types (unicast, anycast, multicast).
- Built-in support for modern security standards (IPsec is mandatory for implementation).
- Automatic configuration mechanisms — SLAAC (Stateless Address Autoconfiguration) and DHCPv6 support.
- Simplified construction of virtual, segmented, and cloud architectures (VLAN, overlay, GRE/IPsec tunnels).
In addition, IPv6 has no “broadcast” packets, which reduces parasitic traffic, and networks can easily be divided into multiple independent subnets using a /64 prefix — the standard for end-user segments.
Table — IPv4 vs IPv6
| Feature | IPv4 | IPv6 |
| Address length | 32 bits | 128 bits |
| Address example | 192.0.2.1 | 2001:0db8:0000:0000:0000:0000:0000:0001 |
| Header size | 20-60 bytes | Fixed 40-byte header |
| Address space | ~4 billion | More than 3.4 × 10³⁸ |
| NAT | Required | Not needed |
| Autoconfiguration | Limited | SLAAC/DHCPv6 |
| Security | Depends on implementation | Built-in IPsec security feature |
Advantages of IPv6
- No need for NAT — true “end-to-end” connections.
- Improved support for QoS and new services (VoLTE, IoT, 5G).
- Built on modern security principles (IPsec is mandatory for implementation).
- Easy connection of new devices and automatic addressing.
Migration and Adoption of IPv6
Many carrier and enterprise networks operate in hybrid mode (dual-stack), where IPv4 and IPv6 run in parallel. This strategy allows providers and large companies to gradually migrate their infrastructure (servers, subscribers, IoT) to the new addressing scheme without losing compatibility.
In modern solutions, such as Stingray DPI by VAS Experts, IPv6 support unlocks flexible scenarios for traffic filtering, accounting, and segmentation, as well as support for new types of devices (mobile subscribers, M2M, Smart City).
Technical FAQ
What is an IPv6 address?
An IPv6 address is a unique 128-bit identifier for a device on a network running the IPv6 protocol. It is used to address and route traffic between computers, servers, mobile devices, and IoT equipment. Thanks to its enormous address space, IPv6 allows a unique address to be assigned to virtually every device without the use of NAT.
What does an IPv6 address look like?
An IPv6 address is written as eight groups of four hexadecimal characters, separated by colons. For example:
2001:0db8:85a3:0000:0000:8a2e:0370:7334
To shorten the notation, sequences of zeros can be replaced with a double colon (::), but only once within a single address. For example, the address above can be written as:
2001:db8:85a3::8a2e:370:7334
This format makes long IPv6 addresses easier to read and administer.
What are the advantages of IPv6 compared to IPv4?
The main advantage of IPv6 is its practically unlimited number of unique addresses, which solves the problem of IPv4 address space exhaustion. In addition, IPv6 simplifies automatic device configuration (SLAAC), reduces the need for NAT, supports more efficient routing, reduces overhead traffic by eliminating broadcast requests, and provides a better foundation for the development of cloud services, IoT, mobile networks, and 5G infrastructure.
Will IPv6 completely replace IPv4?
In the long term, IPv6 is considered the primary internet protocol, but a complete phase-out of IPv4 will still take many years. Today, most telecom operators and organizations use Dual Stack mode, in which IPv4 and IPv6 operate simultaneously. This approach allows infrastructure to be gradually modernized without losing compatibility with existing services and equipment. As a significant portion of the internet continues to use IPv4, both protocols will continue to coexist.
