Those of you who are as old as I am will remember the multi-year attempt to move the United States from the English system of measurements to the metric system. The most visible push came in the form of dual speed signs placed alongside highways across the country. As I recall, the top sign showed the speed limit in MPH while a lower sign expressed the same speed in km/h. The hope was that people would subconsciously work the metric numbers into their heads and one day all the MPH signs could come down without anyone caring. Well, that didn’t happen and after about seven years, those dual signs reverted back to the original expression of MPH. Total fail.
My latest article for No Jitter explores IPv6 and how we need to get on the adoption bandwagon.
Tao, Zen, and Tomorrow 
“As I recall, the top sign showed the speed limit in MPH while a lower sign expressed the same speed in km/h…and after about seven years, those dual signs reverted back to the original expression of MPH.”
Or 8.4 years, if counting metrically.
Ha! I love it!
Majority of the VoLTE/VoWifi networks are using ipv6 (IMS still v4, UEs v6) these days.
Thanks! That’s good to know.
Can you tell me full format of IPv6?
Check is it correct? IPv6 vs IPv4