Why do we still use IPv4?

Answer 1

IPv4, The 32 bit internet address scheme is still in use and most networks, whether or and off the internet, are still using IPv4 and have not yet switched over to the newer IPV6. This is because their networks still work with IPv4; they feel there is no need to change what is not broken; not all equipment is capable of being switched to IPv6, and there may not be sufficient expertise to use IPv6. Also many internet service providers (ISPs) are not yet supporting it.

Although we are running out of assigned IPv4 addresses, we can continue with the current scheme for a while longer using Classless Inter-Domain Routing (CIDR) which redistributes some unused class A and B Network addresses as smaller networks. We can also use Network Address Translation (NAT) to allows multiple machines in a local network to use a single external IPv4 address.

The need for IPv6 is important to new Internet users who need a large number of externally visible internet addresses and the above methods are not sufficient. The use of the Internet-of-Things (IOT) when or if it ever becomes globally implemented and accepted will require a tremendous number of IP addresses and only IPv6 will be able to supply the required number of internet addresses for such personal devices.

Answer 2

weel i think that some people think that IPv4 that we are more used to the IPv4 than the IPv6 .