I was using IPv4 for few years, and now they introduce the jargon of IPv6. Yes i know we scarcity of IP’s and new security features etc..
But where is IPv5..
They started a project call “the internet stream protocol” for voice, video, and distributed simulation. and that’s call IPv5. That was experimental project. So when late 1990 when they started anew project for TCP/IP also call IPng they saw that IPv5 is already reserved for this project so they named it IPv6.
That’s the whole story.