IPv4 apocalypse means we just can't measure the internet any moreIPv4 address exhaustion is making it harder to measure the size of the Internet, even as IPv6 deployment accelerates.While IPv6 activity doubled in 2015 (to 400 million addresses by year-end), the vast majority of users are still on IPv4 addresses, mostly via dynamic assignment or behind carrier-grade Network Address Translation (NAT) boxes.
