For a brief window on March 28, IPv6 carried 50% of Google's worldwide traffic, matching IPv4 for the first time. APNIC pegs global adoption at 43%, and Cloudflare clocks 40% of actual transferred traffic on IPv6. The protocol designed in 1998 is finally pulling its weight.

Necessity, not enthusiasm, did the work. The regional registries ran dry between 2011 and 2019, IPv4 addresses started trading around $50 apiece, and AWS began charging half a cent per public IPv4 per hour in 2024. Older objections about NAT complexity and header overhead have largely faded, with Facebook and Akamai both measuring IPv6 as modestly faster in real-world tests.

For enterprises, the read is straightforward. IPv4 scarcity has been a real line item in cloud bills and acquisition costs, and rising IPv6 traffic suggests that pressure should ease over time. Greenfield deployments increasingly default to dual-stack or IPv6-first, and the addressing constraints that shaped a decade of network design are loosening. Worth watching how hyperscaler pricing and the IPv4 transfer market respond from here.