Why Multi-Cloud Means More IPs
Let’s be blunt: multi-cloud is the standard now. Over 89% of enterprises are running on at least two of the big ones—AWS, Azure, GCP, you name it. You get flexibility, redundancy, all that good stuff. But for the networking team? It’s a beast.
Every cloud environment needs public IPv4 addresses. Load balancers. NAT gateways. VPN endpoints. Direct Connects. Spread your workloads across three clouds and the math gets ugly fast. I’ve seen perfectly healthy address pools drain in just a few months.
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The global IPv4 shortage isn’t breaking news. ARIN and RIPE NCC ran dry years ago. The secondary market is the only real source of new space now. And honestly? Multi-cloud is a huge reason why demand keeps climbing.
The Squeeze Is Real: IPv4 Exhaustion
We’re talking 4.3 billion addresses. For the whole planet. Smartphones, IoT sensors, cloud instances—every single one needs a public IP. IPv6 adoption is happening, but way too slowly. A lot of enterprise gear still speaks IPv4 natively. Multi-cloud just cranks up the pressure. Here’s what I see happening:
- Cloud providers hand out IPs for their own stuff. But you need a whole lot more for transit, peering, and gluing everything together.
- Migrations take forever. You’re running hybrid for months. On-prem and cloud both need IPv4. Your footprint doubles overnight.
- Security teams love dedicated public IPs for logging and inspection. Smart move. But it eats addresses like crazy.
Where Does All the IPv4 Demand Come From?
1. Direct Connect and VPN Terminations
Every interconnect endpoint needs a public IP. If you’re running three clouds in three regions, that’s nine IPs before you even spin up a single workload. The math adds up fast.
2. NAT and Egress Gateways
Outbound traffic needs NAT gateways. Each VPC usually gets its own. And if you need static outbound IPs for whitelisting—and who doesn’t?—you’re locking in more addresses. Don’t even get me started on troubleshooting asymmetric routing because you skimped on gateways.
3. Reserved and Elastic IPs
Network engineers hoard these for failover and scale. Good practice. But do this across every region and cloud provider, and you’ve burned through a whole /24 before you know it.
4. IPAM Headaches
Everyone talks about overlapping private ranges. Sure, that’s annoying. But public IPs have to be globally unique. Buy fragmented blocks from different sellers, and you’re asking for BGP conflicts. Clean, contiguous /24s are worth their weight in gold.
| Driver | Typical IPv4 Consumption | Multi-Cloud Impact |
|---|---|---|
| Direct Connect endpoints | 1-2 IPs per link | 3-6 IPs per cloud region |
| NAT gateways | 1 IP per gateway | 1 IP per VPC per cloud |
| Reserved elastic IPs | 5-20 IPs per environment | 5-20 IPs per cloud per region |
| Load balancers | 1 IP per balancer | 2-4 IPs per service per cloud |
How to Avoid an IPv4 Crisis in Your Cloud
I’ve been through this cycle more times than I care to count. Here’s what actually makes a difference:
- Audit everything. Find the IPs sitting idle and snatch them back.
- Push for IPv6. It’s a slog, but most clouds support dual-stack now. Start new services on it.
- Get a real IPAM tool. phpIPAM, NetBox. Make sure it talks to your cloud APIs.
- Stop buying tiny subnets. Go to a broker and get a /24 or a /22. It costs way less in the long run.
- Reserve space for the next 12 months. Multi-cloud moves fast. A shortage will stall a migration dead in its tracks.
Getting Clean Space: How IP4 Market Can Help
I’ve bought and sold my share of address space. The RIRs are empty. The secondary market is your only real option. I’ve used IP4 Market a few times now. The platform is solid. Every block is verified for blacklisting and conflicts. No surprises.
When you’re managing a messy multi-cloud setup, being able to grab a clean /24 or /22 quickly is a lifesaver. IP4 Market handles the escrow, the transfer paperwork, and the support. You avoid the nightmare of chasing down unverified sellers or trying to stitch together fragmented space.
