(Image credit: Getty Images) The IPv6 protocol is among the list of important things that make up the backbone of the internet, and yet barely anyone talks about it. Designed in 1998 as a replacement for IPv4 and its limited number of addresses, IPv6 was dismissed early on as a headache-inducing, hard-to-implement complication that would hardly ever gain any traction — despite offering 2^128 possible numbers, solving all network number assignments in one fell swoop. That changed over time by force of necessity, and Google's tracking graph shows that for a brief moment in time on March 28, 50% of worldwide users accessed the service over an IPv6 connection, marking a historic first. APNIC's stats show that the protocol is in use by 43% of the world, with Asia and the Americas inching ever close to those 50%. Cloudflare, meanwhile , shows that 40% of traffic is done in IPv6, an actually impressive figure if you consider it's measuring actual transferred packets rather than just counting addresses.…