IPv4 Scarcity Solutions: How Cloud Providers Adapt

Cloud providers keep the internet running. That much is obvious. But behind the scenes they’re dealing with a problem that won’t go away: there simply aren’t enough IPv4 addresses left. The free pool dried up years ago, and what remains has to be stretched, shared, or bought at a premium. I’ve watched this squeeze tighten over the past decade, and the IPv4 scarcity solutions that major platforms have cobbled together are worth understanding—whether you’re running a cloud architecture or just trying to keep your company’s networking costs under control.

The Reality of IPv4 Exhaustion

This isn’t theoretical. The last /8 blocks were handed out by regional registries between 2011 (APNIC) and 2019 (AFRINIC). That’s it. That’s the end of the line for new allocations. Now the only path to fresh IPv4 space runs through the secondary market, where prices have climbed from single digits per IP ten years ago to over $50 in 2024. Some desirable /24 blocks push past $60. For a cloud provider running hundreds of data centers, that kind of math hurts. It’s a real operational expense now, not some line item you can ignore.

So AWS, Google Cloud, Microsoft Azure, and the smaller players have had to get creative. What they’ve built is a patchwork of IPv4 scarcity solutions—part technical workaround, part market maneuvering.

Key Strategies Cloud Providers Use

1. Carrier-Grade NAT (CGNAT) and Shared IPs

The blunt instrument. Share one public IPv4 among many customers through Carrier-Grade NAT. Cloud providers hand out private RFC 1918 addresses to VMs, then map multiple machines to a single public IP via port address translation. For outbound traffic, this is the default in many environments. It works. Mostly. But the cracks show up fast:

• Anything needing inbound connections—web servers, obviously—can’t live on a shared IP.
• Rate limiting and logging get messier.
• Gaming, VoIP, peer-to-peer apps? They struggle behind CGNAT. Sometimes badly.

The provider’s answer: charge a premium for dedicated public IPs. Scarcity, monetized.

2. Bring Your Own IP (BYOIP)

If you’re a large enterprise or ISP sitting on IPv4 blocks you already own, BYOIP lets you bring that space into a cloud provider’s network. You keep control of the addresses while running on their infrastructure. AWS, Google Cloud, Azure—all support it. But it’s not a flip-the-switch operation. You need to verify ownership through RIR records and route origin authorizations (ROA), advertise the prefix from the cloud provider’s network, and navigate each platform’s specific technical and contractual requirements. It’s a solid IPv4 scarcity solution if you have addresses. If you don’t, it doesn’t help you at all.

3. Dual-Stack and IPv6 Adoption

Every major cloud platform supports IPv6 natively now. Dual-stack deployments let services run both protocols, which eases the pressure on IPv4. The catch? Global IPv6 adoption among end users still sits below 40%. Plenty of legacy systems flat-out require IPv4. Providers push IPv6 by offering it at no extra charge, which is sensible, but the transition is slow—frustratingly slow, if you ask me. IPv6 alone isn’t a complete IPv4 scarcity solution. It helps. It’s necessary. But it has to be paired with something else.

4. Leasing and Purchasing on the Secondary Market

This is where the real action is now. Cloud providers buy or lease IPv4 blocks on the secondary market to fill the gaps in their own inventories. It’s standard practice. Amazon has acquired entire /8 blocks from various sellers over the years. Smaller providers tend to lease /24 or /23 blocks for shorter-term needs. The secondary market has effectively become the primary source of new IPv4 space—unless you’re one of the few legacy holders still sitting on a massive untouched allocation.

The Role of IPv4 Transfer Markets

The secondary market for IPv4 has grown up. It’s not some sketchy backchannel anymore—regional registries oversee the transfers, and marketplaces have stepped in to make the actual transactions work. Cloud providers are among the biggest buyers, often scooping up blocks in bulk. Here’s what the market looks like in 2024:

For cloud providers, buying on the open market is often cheaper than the operational headache of running CGNAT at massive scale. But you have to do your homework. Addresses need to be clean—no blacklists, no baggage—and transfers must comply with RIR policies. That’s where a broker like IP4 Market actually earns its keep: verified listings, escrow, people who know the regulatory terrain.

Future Outlook and Best Practices

IPv4 scarcity isn’t going away. Even as IPv6 creeps forward, the existing IPv4 internet will keep humming along for decades. Cloud providers will keep juggling IPv4 scarcity solutions the way they do now—technically and commercially. For those of us on the engineering or IT management side, a few things seem clear:

• Plan ahead: If your workloads need dedicated public IPv4, budget for it. Prices aren’t dropping. I’d bet on them staying flat or climbing.
• Consider leasing: For short-term needs, leasing beats buying—especially if your future usage is uncertain.
• Use dual-stack: Turn on IPv6 now. Reduce the IPv4 dependency while you still have time to do it on your own schedule.
• Work with reputable marketplaces: When you’re buying or leasing, use platforms that verify sellers and handle the compliance side. IP4 Market offers that kind of transparent, secure environment regardless of transaction size.

The internet keeps growing. IPv4 scarcity solutions will stay relevant whether we like it or not. The organizations that fare best will be the ones treating this as a long-term reality, not a temporary inconvenience.