IANA Global Policy: How IPv4 /8 Allocations Shape Markets

IPv4 /8 Allocations: Why IANA Policy Still Matters

A /8 handed out by IANA is the biggest chunk of address space anyone ever got in one go — 16,777,216 addresses. Every single one. And here’s the thing: even though the IANA global pool ran dry back in 2011, the rules that governed those historic /8 allocations still shape how scarcity works, what prices look like, and who can transfer what in today’s IPv4 market. If you’re a network engineer, an IT manager, or you run an ISP and you’re trying to buy address space in 2025, you need to understand this legacy. There’s no way around it.

The History of IANA /8 Allocations

IANA — the Internet Assigned Numbers Authority — used to hand out IPv4 space in /8 blocks, sometimes called “Class A equivalents,” to the Regional Internet Registries and, back in the early days, straight to big organizations. Each /8 holds 16.7 million addresses. Getting one meant you were serious. Real infrastructure, real scale.

The Five RIRs and Their /8 Holdings

Over the years IANA distributed the 256 possible /8 blocks among five RIRs, each covering a different part of the world:

What Happened at IANA Exhaustion

February 3, 2011. That’s the date IANA allocated its final five /8 blocks — one per RIR — and formally triggered the “Global Policy for Post-Exhaustion IPv4 Resources.” Those last blocks weren’t handed out freely. They were rationed:

• APNIC got 1.0.0.0/8 and capped everything after that at a single /22 per member.
• RIPE NCC received 2.0.0.0/8, with the same /22-per-LIR cap.
• ARIN, LACNIC, and AFRINIC each got a /8 too, but under stricter rationing rules specific to their regions.

The idea behind the global policy was simple enough: keep a minimal trickle of addresses flowing so every region could support operators building IPv6 transition infrastructure. What it actually did, in practice, was push everyone toward the secondary market.

How RIRs Distribute Legacy Space Today

These days, essentially all IPv4 supply moves through two channels: RIR-run transfer markets and reclaimed or returned space. And each RIR plays by its own rules when it comes to /8-derived space:

• ARIN allows freely specified transfers at any block size, with a waiting list and needs-based review for the bigger requests.
• RIPE NCC permits both intra-region and inter-RIR transfers — one of the most liquid markets around.
• APNIC supports transfers, though persistent regional demand keeps pushing prices up.
• LACNIC and AFRINIC stay more restrictive, limiting cross-border transfers, which keeps regional liquidity low.

Returned blocks — often fragmented pieces of legacy /8s that RIR recovery projects have cleaned up — get recycled in small lots. Which reinforces the /22 minimum-deployment convention, a convention that traces right back to IANA’s post-exhaustion policy.

The Market Impact of /8 Legacy Blocks

Scarcity. That’s the story of the IPv4 market, full stop. Since 2015, per-address prices have climbed from roughly $5–8 to $25–40+ per IP, depending on where you are and how big your block is. A few factors rooted in /8 legacy policy drive this:

1. The /22 Benchmark

The last free allocations were capped at /22, so that block size became the de facto unit of demand for small and mid-sized networks. A /22 (1,024 addresses) is now the most liquid trade size, and its pricing anchors everything else.

2. Legacy Holdings and Unrealized Supply

Organizations sitting on legacy /8s got them decades ago, often for nothing. A lot of those blocks are underutilized. Some are entirely dark. Tens of millions of addresses, by most estimates, just sit unused in legacy space. As holders modernize or shut down, that space trickles into the transfer market — slowly. Painfully slowly, if you’re a buyer. Which is exactly why prices stay elevated.

3. Regional Price Disparities

Note: prices fluctuate by region, RIR, and prefix reputation. Clean, routable space with no blacklisting commands premiums.

Practical Advice for Buyers and Sellers

Buying or divesting — either way, a few habits will protect your investment:

1. Verify RIR registration and clean history. Check the prefix against RPKI status, spam blocklists, and abuse databases before you sign anything.
2. Know your RIR’s transfer fees and timelines. ARIN and RIPE transfers typically close in 30–90 days; budget for due diligence and listing fees.
3. Consider leasing as a bridge. If capex is tight, leasing IPv4 space gets you capacity now without a long-term commitment.
4. Fragmentation kills value. Contiguous blocks beat scattered /24s — on price and on operational sanity (BGP announcements, filtering, geolocation).
5. Plan for IPv6 in parallel. Every /22 you buy today should sit next to a documented IPv6 deployment strategy. Dual-stack is the long-term answer; IPv4 is a bridge asset.

This is where a trusted partner matters. IP4 Market runs a verified marketplace for buying, selling, and leasing IPv4 addresses — pre-screened sellers, transparent pricing, and full support through RIR transfer procedures, so you stay clear of the gray market’s pitfalls.

Frequently Asked Questions

Conclusion: Legacy Policy, Modern Market

The /8 allocation model and the post-exhaustion global policy wrote the DNA of today’s IPv4 market: scarcity, the /22 standard, regional price divergence, and a busy secondary market. Organizations that understand these dynamics — and that transact through verified channels — get their address space sorted efficiently while positioning themselves for the eventual IPv6-dominant future. When you’re ready to buy, sell, or lease, IP4 Market offers the verified sellers and competitive pricing that make IPv4 transactions safe and straightforward.