This document discusses various methods of measuring IPv6 adoption, including registry data from RIPE and APNIC, routing information from RIS, and active measurements from tools like RIPE Atlas, APNIC, Google, Cisco, Maxmind, and Alexa. Registry data shows that while Israel has 550% more registered IPv6 space than IPv4 space, IPv6 usage according to various measurement sources is only around 0.8-17.24%. The document cautions that IPv6 measurement data can vary in quality and interpretation.