At-a-Glance: Key IPv4 & IPv6 Facts
- Total IPv4 address space: 4.29 billion (theoretical maximum)
- Usable IPv4 addresses: ~3.7 billion (approx.)
- Global IPv4 free pool: Effectively exhausted
- IPv6 address space: ~3.4×1038 addresses
This page is a static, versioned reference intended for citation. It summarizes IPv4 exhaustion status and IPv6 adoption using data from regional internet registries (RIRs) and public IPv6 measurement sources.
What “IPv4 Exhaustion” Means
IPv4 uses 32-bit addressing, which limits the number of unique addresses available globally. In February 2011, the Internet Assigned Numbers Authority (IANA) allocated the final IPv4 blocks to the five Regional Internet Registries (RIRs). Since then, each RIR has exhausted its general-use IPv4 pool. New IPv4 addresses are mainly obtained via transfers, reclamation, and secondary markets rather than fresh allocations.
Country Breakdown: IPv4 Allocation & IPv6 Adoption
“Allocated IPv4” reflects historical allocations and assignments, not “free IPv4 remaining.” “IPv4 availability” indicates whether new allocations are generally possible without transfers. “IPv6 adoption” represents the share of users or traffic observed over IPv6-capable networks (measurement varies by provider/source).
Key Highlights (2026)
- Highest IPv6 adoption: India (~70%), Sweden (~65%), Netherlands (~62%)
- Largest IPv4 allocations: United States, China, Japan
- Global IPv4 status: No remaining free pool across all RIRs
Table note: Countries are grouped by historical IPv4 allocation levels and IPv6 transition status. Values are approximate and intended for comparative reference.
| Country | Allocated IPv4 | IPv4 Availability | IPv6 Adoption |
|---|---|---|---|
| High IPv4 Allocation (Early Internet Adoption) | |||
| United States | 1.5B+ | Near zero | ~52% |
| China | 330M+ | Near zero | ~35% |
| Japan | 190M+ | Near zero | ~45% |
| Germany | 110M+ | Near zero | ~55% |
| United Kingdom | 95M+ | Near zero | ~50% |
| Moderate Allocation / Transitioning Regions | |||
| Brazil | 90M+ | Very low | ~40% |
| France | 85M+ | Near zero | ~48% |
| Canada | 75M+ | Very low | ~42% |
| South Korea | 70M+ | Near zero | ~60% |
| India | 45M+ | Very low | ~70% |
| Australia | 45M+ | Very low | ~38% |
| Italy | 39M+ | Near zero | ~45% |
| Spain | 36M+ | Near zero | ~50% |
| Russia | 35M+ | Near zero | ~30% |
| Mexico | 33M+ | Very low | ~32% |
| Lower Allocation / IPv6-Forward & Emerging Regions | |||
| Netherlands | 42M+ | Near zero | ~62% |
| Sweden | 30M+ | Near zero | ~65% |
| Indonesia | 26M+ | Very low | ~55% |
| Thailand | 25M+ | Very low | ~50% |
| Vietnam | 24M+ | Very low | ~52% |
| South Africa | 22M+ | Very low | ~35% |
| Argentina | 21M+ | Very low | ~40% |
| Nigeria | 20M+ | Very low | ~25% |
Download the complete dataset (CSV)
For print or citation, reference this table as: MyIPNow IPv4 & IPv6 Exhaustion Statistics by Country (2026).
How to Use These Statistics
- For writers: cite the year (2026) and link to this page or the CSV.
- For researchers: use the CSV as a baseline dataset and keep the year in your methodology.
- For network teams: treat IPv4 allocation levels as legacy distribution; IPv6 adoption is the forward-looking signal.