IPv6 Crosses 50% of Google's Users — But the Number Depends Who's Counting

Google’s continuous measurement of how many of its users reach its services over IPv6 has passed 50% for the first time, a milestone that confirms the protocol is mature and operating at global scale. The headline figure hides wide regional variation, however. Google publishes only aggregate and per-economy totals, so the divergent adoption curves in places like India, Vietnam, and Saudi Arabia don’t surface in its data. APNIC Labs, which runs its own measurement using ads delivered through Google’s network, puts global IPv6 capability lower, at 42%.

The gap comes down to methodology rather than disagreement about the underlying network. APNIC can’t simply sum raw samples because Google optimizes ad delivery for revenue, skewing how many measurements land in each economy on any given day. Instead it weights each economy’s measured capability by its estimated internet population, so large markets like India, China, and Indonesia carry proportionally more weight. At the per-economy level APNIC’s numbers track closely with Google, Cloudflare, Akamai, and Cisco; the global divergence stems from the weighting model. Since APNIC tends to read lower than Google, the two figures usefully bracket the likely true range.

The author pushes back on the framing that a slow climb to 50% signals IPv6’s failure. Adoption has been uneven because deployment demands real capital, and operators rationally protect existing IPv4 investments while newcomers — notably mobile carriers like Reliance Jio — adopt IPv6 first to cut total cost of ownership. The internet now runs as a genuine two-protocol system stitched together by NAT, CGNAT, and translation layers, with interoperability handled above IP by transport protocols like TCP, UDP, and QUIC. Claims that “IPv4 works fine” ignore the operational complexity already baked into modern IPv4 networks.