ipv4 header has more layers than ipv6 14 and 8 respectively.what will be the parameter in checking the header on both ips ?

Hello Team.please the portal is very slow .is someone expericing similar issue

Remaining ipv4 address is about 3.7 billion if all these ips are assigned to users who are online then what will be left to be assign whn new joiners come.

ipv6 ran on 128 bit. i belive the foundation of ipv6 is very much needed in the network translation