Скачать или смотреть BalticNOG - The Curious Case of IPv4: Sustaining the Internet Until IPv6 Arrives - Paulius Judickas

The Internet has officially run out of IPv4 addresses, yet the world still runs largely on IPv4. Despite 25 years of work, IPv6 adoption remains below 40% of users in 2025, and projections suggest a full transition may not complete until the mid-2040s. So how has the Internet kept growing? NATs, CDNs, and creative address sharing have stretched IPv4 far beyond its intended limits — but these solutions come with challenges.

This keynote explores the paradox of IPv4 scarcity and sustainability. It looks at why the IPv6 transition has slowed, how market forces stabilized IPv4 prices, and why leasing has emerged as a pragmatic solution. Leasing re-circulates idle IPv4 space, provides revenue for holders, and offers affordable access for operators — effectively turning IPv4 into a renewable resource.

The session connects technology, economics, and policy to show how IPv4 leasing is bridging the gap between scarcity and the sustainable, long-term adoption of IPv6.