Why old internet addresses sell for millions

A finite address space became a market

IPv4 addresses are the familiar numeric addresses that let devices and servers be found on the internet. The system has a fixed supply: its 32-bit format allows roughly 4.3 billion possible addresses. Many were assigned during the internet’s early growth, when the need seemed smaller. Once the central pool of unassigned IPv4 addresses was exhausted, organizations could no longer request large new blocks from that source.

That did not make existing addresses unusable or immovable. Organizations with more than they needed could transfer blocks to others, subject to the rules of the relevant internet registry. In effect, a resource once allocated administratively acquired a resale market.

Why a company might pay rather than wait

A growing cloud provider, network operator, or online service may need many addresses to connect customers, host services, or separate parts of its infrastructure. IPv6—the newer internet protocol, with a vastly larger address space—offers a long-term way around IPv4 scarcity. But moving everything to IPv6 takes engineering work, and some customers, networks, or equipment still depend on IPv4. Companies often have to support both.

Sharing one public IPv4 address among many users can help stretch supply, but it adds complexity. A company may decide that buying or leasing a block is worth the cost if it makes expansion simpler or avoids changes to systems that expect distinct IPv4 addresses.

The price reflects scale and convenience

The headline-grabbing sums are for sizeable blocks, not for a single address. A buyer is paying for access to a scarce, usable pool—and for the ability to put it to work without waiting for the whole network to change. The seller, meanwhile, can turn an underused allocation into money.

That makes IPv4 a transitional asset: its scarcity has economic value even as the internet moves toward IPv6. A company can spend millions to secure room to grow today, while still investing in a protocol designed to make that kind of address shortage far less likely.