The finite supply of IPv4 addresses has transformed what was once a technical utility into a high-value digital asset, with market prices for address blocks climbing steadily as global demand for internet connectivity outpaces the available stock. Because the original architecture of the internet only supports approximately 4.3 billion unique IPv4 addresses, the exhaustion of these identifiers has created a secondary market where organizations—ranging from startups to multinational corporations—buy and sell blocks of numbers to maintain their network infrastructure, according to industry data from the Number Resource Organization (NRO).
As the primary steward of global internet resources, the Internet Assigned Numbers Authority (IANA) officially exhausted its central pool of unallocated IPv4 addresses in 2011. Since that time, the five Regional Internet Registries (RIRs)—including the American Registry for Internet Numbers (ARIN) and the RIPE Network Coordination Centre—have managed the remaining regional allocations, which have also been depleted. This scarcity has forced entities that need large quantities of addresses to purchase them from organizations that possess underutilized legacy blocks, a practice that has effectively turned IP addresses into a commoditized financial asset.
The Economics of Scarce Address Space
The transition of IPv4 addresses from a public resource to a tradable commodity has been driven by the fundamental law of supply and demand. Unlike physical infrastructure, IP addresses are intangible, yet they are essential for any device or server to communicate on the public internet. According to reports from network brokerage firms, the price of a single IPv4 address has fluctuated significantly over the last decade, often ranging between $20 and $50 per address depending on the size of the block being transferred and the urgency of the buyer’s requirement. Large blocks—such as a /16 prefix, which contains 65,536 addresses—can command multi-million dollar price tags in private transactions.
This market is not regulated by a single global price index, but rather operates through specialized brokers who facilitate transfers between entities. Organizations that received large allocations of IP space in the early years of the internet—before the protocols were widely commercialized—often find themselves in possession of “legacy” space that is now highly valuable. By selling portions of this space, these companies can generate significant revenue, a trend observed frequently in the telecommunications and academic sectors, as noted by the Internet Corporation for Assigned Names and Numbers (ICANN).
The IPv6 Imperative
While the market for IPv4 continues to tighten, the long-term solution promoted by network engineers is the adoption of IPv6. Designed to replace IPv4, the IPv6 protocol provides a near-infinite supply of addresses—approximately 340 undecillion—by using a 128-bit address scheme instead of the 32-bit scheme used by its predecessor. Despite the clear advantages in capacity, the transition to IPv6 remains slow due to the lack of backward compatibility with older hardware and the significant investment required to upgrade network infrastructure, according to monitoring data from the Google IPv6 Adoption Statistics.
Many organizations choose to continue using IPv4 through a technique known as Carrier-Grade NAT (CGNAT), which allows multiple devices to share a single public IPv4 address. While this helps conserve the existing supply, it introduces complexities for network management, security, and certain types of peer-to-peer applications. Consequently, the reliance on IPv4 persists, keeping the market for address transfers active even as the technical community pushes for a full migration to the newer standard.
Risks in the Secondary Market
The high value of IPv4 blocks has also attracted security risks, specifically the threat of “IP hijacking.” This occurs when malicious actors advertise IP address ranges they do not own, often to facilitate spamming, phishing, or to circumvent geographic restrictions. Because the Border Gateway Protocol (BGP)—the system that routes traffic across the internet—was not originally built with robust security features, verifying the legitimacy of an IP advertisement requires constant vigilance from network administrators, according to guidance provided by the Cybersecurity and Infrastructure Security Agency (CISA) regarding BGP security.
Organizations looking to acquire address space are advised by the RIRs to conduct thorough due diligence. This includes verifying the “cleanliness” of the IP addresses—ensuring they are not blacklisted by major email providers or security services—and ensuring the transfer is registered correctly within the official database of the relevant Regional Internet Registry. Failure to follow these formal procedures can lead to legal disputes or the eventual reclamation of the addresses by the registry.
As the internet continues to expand, the pressure on IPv4 availability will likely remain a fixture of the digital economy. While IPv6 is the intended destination for global networking, the immediate, high-stakes trade of IPv4 addresses highlights the ongoing challenge of maintaining the infrastructure that supports the modern web. Industry observers expect the market for these assets to continue until the cost of maintaining IPv4 networks exceeds the cost of a full, enterprise-wide transition to IPv6.
Readers interested in the current status of IP allocations or wishing to monitor regional address exhaustion can access the official dashboards maintained by the NRO. Comments and insights regarding the impact of these market trends on your own network operations are encouraged below.