IPv4 investment strategies for forward-thinking ISPs

IPv4 investment strategies for forward is a public record based on article evidence, entity context, event links, and relationship context.

IPv4 prices have fallen to 10-year lows some /16 blocks now trade below $20 per address, down from $50+ peaks. For ISPs, the question is no longer whether to invest, but how. Leasing is surging 24% year-over-year as operators prioritise flexibility over ownership. We examine four investment strategies and a decision framework to help you choose. A mid-sized European ISP faced an awkward decision last spring. Her network team needed additional IPv4 space to support a planned broadband expansion.

The budget offered two paths: purchase a /20 block outright at prices that had fallen to 10-year lows, or lease equivalent capacity with flexibility to scale. The choice would shape the company’s balance sheet for years. This scenario captures the central challenge facing internet service providers in 2025. IPv4 scarcity remains a strategic reality, but the investment landscape has shifted dramatically. Prices for large blocks have declined some /16 transactions now fall below $20 per address, down from peaks exceeding $50 just two years earlier. The leasing market is surging, with 24 per cent year-over-year growth projected.

IPv6 traffic approaches 50 per cent globally. For ISPs, the question is no longer whether addresses have value. That is established. The pressing question is: what investment strategy best serves your specific circumstances in this maturing market? Understanding the 2025 Strategic Landscape Before examining specific strategies, ISPs must recognise four fundamental realities shaping investment decisions this year. First, prices have stabilised at lower levels. Large block prices (/16+) decreased significantly through 2025, falling from around $30 per address early in the year to below $20 per IP by mid-year for some /16 transactions.

This represents a substantial correction from the $45-50+ peaks observed in 2023-2024. The decline reflects increased supply from unused inventory entering the market, not diminished demand. Second, leasing has become the growth engine. The leasing market is experiencing robust expansion, with industry analysts projecting 24 per cent year-over-year growth in volumes. This shift reflects changing attitudes: IPv4 is increasingly viewed as operational capacity to be accessed, not necessarily as an asset to be owned. Third, regional pools remain uneven.

APNIC Labs reported approximately 3.9 million addresses remaining in available RIR pools as of early 2026, with the majority held in APNIC (3.1 million) and AFRINIC (773,000). This concentration affects regional pricing and availability. Fourth, IPv6 coexistence is now the operational norm. As IPv6 traffic approaches 50 per cent globally, IPv4 increasingly operates alongside translation technologies such as CG-NAT, yet remains critical for infrastructure compatibility and enterprise networks. With this foundation established, we can examine the strategic options available to ISPs in 2025.

Also Read: What Makes An IP Address A Form Of Digital Capital Strategy One: Strategic Acquisition at Lower Prices Best suited for: Established operators with clear long-term infrastructure needs and available capital. The price correction in 2025 presents opportunities for operators who previously found acquisition costs prohibitive. Large blocks trading below $20 per address represent significantly improved economics compared to recent years. However, lower prices do not automatically justify acquisition. The investment thesis must rest on demonstrated need, not speculation.

Advantages: Reduced entry cost compared to 2023-2024 peaks Eliminates ongoing leasing costs for base-load capacity Asset appears on balance sheet Risks: Prices may decline further if IPv6 adoption accelerates Capital deployed to IPv4 cannot be used for revenue-generating infrastructure Potential stranded assets if IPv6 transition exceeds projections Decision framework: This strategy makes sense when you can demonstrate clear need within a 5-7 year horizon. Stress-test investments assuming IPv6 adoption rates of 60-70% by 2030.

Regional note: Hong Kong’s dual-stack IPv6 traffic reached only 3 per cent in 2025, suggesting IPv4 dependency will persist longer in certain markets. Strategy Two: Leasing for Operational Flexibility Best suited for: Growth-stage operators, providers entering new markets, or those prioritising capital preservation. Leasing has emerged as the dominant growth strategy in 2025, with market volumes increasing 24 per cent year-over-year. The economics are compelling: operators can access IPv4 capacity at 15-20 per cent of purchase price annually, preserving capital for revenue-generating infrastructure.

A regional broadband provider in Northern England leased 8,192 addresses for 24 months to serve a 5,000-home development. Total costs ran approximately £98,000 versus £400,000+ for purchase at then-current rates. Leasing offered superior flexibility despite lower purchase prices today.

Advantages: Preserves capital for fibre, equipment, and market expansion Matches costs to actual subscriber growth Flexibility to adjust capacity as IPv6 adoption evolves Risks: Ongoing operational expense versus one-time capital investment Does not build long-term asset base Decision framework: Leasing works best when demand uncertainty is high or capital is constrained. Calculate the break-even point: if lease costs exceed 20-25% of purchase price annually, purchase may be preferable. Strategy Three: Hybrid Portfolio Approaches Best suited for: Most operators this is increasingly the default strategy for sophisticated ISPs.

The maturing market has encouraged portfolio thinking rather than binary choices. Sophisticated ISPs combine acquisition and leasing based on specific use cases, distinguishing between “base load” addresses (predictable, long-term needs) and “peak load” addresses (variable, uncertain demand). Base load: Purchase at current attractive prices. These addresses support core subscriber base with predictable growth. Peak load: Lease strategically. These addresses support new market entries, temporary capacity needs, or experimental services.

One German ISP purchased IPv4 space for 75 per cent of projected five-year demand at approximately $22 per address, then established leasing relationships for the remaining 25 per cent. Annual leasing costs ran approximately €150,000, balancing cost certainty with operational flexibility. Advantages: Optimises capital allocation across certainty spectrum Balances risk and flexibility Builds asset base while maintaining optionality Risks: Requires more sophisticated planning and tracking Demands clear internal criteria for purchase versus lease decisions Decision framework: Implement a formal review process.

Require business cases for purchases exceeding specific thresholds (e.g., /22 blocks or larger). Track utilisation rigorously. Review quarterly. Strategy Four: Active Portfolio Management Best suited for: All operators this is table stakes, not optional. Perhaps the most overlooked strategy involves internal optimisation. Before acquiring additional addresses, ISPs should audit existing holdings for underutilisation. The influx of unused inventory into the 2025 market demonstrates that many operators hold addresses they do not actively need.

One mid-sized operator discovered it held 12,000 addresses in low-utilisation segments space that could be redeployed rather than purchased. The discovery saved an estimated €500,000. Some operators monetise genuine surplus through leasing, turning idle assets into revenue.

Key practices: Track utilisation rates by block and segment Identify addresses assigned but not actively routed Reclaim space from departed customers promptly Consider monetising genuine surplus through selective leasing Advantages: Reduces or eliminates acquisition needs May generate revenue from surplus capacity Requires minimal capital investment Decision framework: Conduct a comprehensive audit before any major acquisition. Establish utilisation targets (e.g., 75 per cent minimum for active blocks). Review quarterly.

Making the Decision: A Practical Framework for 2026 ISPs facing IPv4 investment decisions should work through these questions systematically: What is our actual need? Model subscriber growth, address utilisation per customer, and IPv6 transition timelines. Factor in CG-NAT and other conservation technologies. What capital is available? Compare IPv4 investment against alternative uses. Will fibre deployment generate higher returns? What is our risk tolerance? Can you absorb price declines if purchasing? What is our regional context?

Consider regional IPv6 adoption Hong Kong’s 3 per cent suggests different timelines than markets approaching 50 per cent. What governance exists? Establish clear approval processes. Require business cases. The Bottom Line for 2026 The 2026 IPv4 market offers ISPs more options and better economics than at any point in the past decade. Lower prices reduce acquisition barriers. The leasing market growing 24 per cent year-over-year provides flexibility. The strategic question remains: what approach best serves your circumstances? Certain principles apply universally: Treat IPv4 as strategic capital, not operational overhead.

This requires executive attention. Audit before acquiring. The market’s increased supply partly reflects operators discovering they hold more than they need. Match strategy to certainty. Purchase when demand is predictable. Lease when uncertainty is high. Think in portfolios. Most operators benefit from hybrid approaches. Review regularly. Market conditions have changed dramatically in 2025. Strategies that made sense at $50 per address require reevaluation at $20. The operators who thrive will approach IPv4 investment with the same rigor applied to spectrum acquisitions or fibre deployments.

As one ISP CFO put it in mid-2025: “We used to treat IP addresses like utilities. Now we understand they’re strategic assets. The lower prices made decisions easier, but the thinking process matters more than the price point.” That shift from utility to asset, from tactical to strategic may be the most important investment any ISP can make. Also Read: Why Most ISPs Miss Massive Revenue Opportunities From IPv4