IPv6 address allocation: what you need to know

By: Stephanie Published: 2025-07-30

Table of Contents

IPv6 allocation rules ensure fair global distribution and help organisations prepare their networks for long-term scalability.
Careful planning, documentation, and good management practices are essential for requesting and using IPv6 space effectively.

How IPv6 addresses are assigned

IPv6 addresses are assigned by a global system. When requesting IPv6 space, an organisation requests information about its network, technology requirements, as well as long-term goals. Typical regional policies demand that one present a deployment plan within a timeframe, efficient use of the allocated space in the event allocated space exists, and appropriate use of routing, aggregation, and documentation policies.

What organisations get

Internet service providers usually receive a /32 block, which offers large-scale address capacity for customer services. Smaller enterprises or networks often receive a /48 block, which still provides flexibility for internal growth. Once allocated, organisations are responsible for managing the addresses properly. This involves setting up hierarchical addressing plans, preparing for future expansion, maintaining accurate routing announcements, and managing reverse DNS records. Good management strengthens not only the local network but the stability of the wider internet.

Allocation duties

IPv6 allocations are not dependent on IPv4 holdings, thus even non-IPv4 organisations are eligible to apply. Obtained address space must be put to optimum use upon reception. It can be audited by regional registries to recover idle or unused space, if necessary, in order for resources to be equally assigned. It makes the address ecosystem sustainable as well as balanced.

Why IPv4 remains relevant even in the IPv6 era

While IPv6 holds the key to the future, IPv4, however, still remains central in the modern-day operation of the internet. The vast majority of global networks, devices, and services continue to utilize IPv4, predominantly because the vast majority of systems, applications, and infrastructure are yet to be migrated to IPv6. For the vast majority of organisations, keeping the environment ‘dualstacked,’ such that IPv4 and IPv6 are run side by side, remains essential in the continuation of unfettered connectivity, compatibility, and, crucially, a gradual migration. IPv4 continues to be central in regards to keeping the ‘door open’ to the legacy system, reaching non-IPv6-capable networks, as well as transitioning in as gradual a process as possible. While IPv6 deployment becomes ubiquitous in the long run, IPv4 management will continue in the same manner, thus the importance of organisations treating, governing, and respecting the two protocols equally.

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FAQs

Who can apply for IPv6 addresses?

Organisations such as internet service providers, companies, research networks, and government bodies that need global address space can apply through their regional registry.

How much IPv6 address space is usually assigned?

It depends on what the organisation requires, although service providers tend to get a /32 block and smaller networks may receive a /48.

Is IPv6 linked to IPv4?

No. IPv6 allocations are separate, and organisations that don’t have IPv4 can request IPv6 addresses.

What if the IPv6 space isn't employed?

Allocations may be reviewed, and underutilised space can be reclaimed to maintain fairness and efficiency.

Why IPv6 allocation matters now?

It allows organisations to scale, adopt new technologies, and avoid the technical and financial limits posed by IPv4 exhaustion.