"This is a crucial phase in the transition because while IPv6 is widely deployed in many networks, it's never been used at such a large scale before."

Colitti has been a strong supporter of global cooperation in this regard and has worked with the Internet Society to organise the day.

Facebook's Donn Lee that testing was needed as recent studies indicated about 0.05 per cent of, or one in 2000, Internet users couldn't reliably connect to websites that enable both IPv4 and IPv6 addresses.

"This has resulted in a classic chicken-and-egg puzzle right now: Websites don't want to enable IPv6 because a small number of their users may have trouble connecting," the post reads.

"At the same time, doing nothing means that ever more users will have trouble connecting to these dual-stacked websites, and ISPs will turn to less effective technical alternatives like Large Scale NAT (Network Address Translation)."