[Emmanuel Ngetich]

IPv4 has lasted due to Network Address Translation (NAT) that allows multiple devices to share a single public IP, widely used in homes and enterprises, Dynamic Host Configuration Protocol (DHCP) recycles IP addresses by assigning them temporarily, Classless Inter-Domain Routing (CIDR) has improved efficiency in address allocation by breaking networks into smaller subnets and IPv4 markets organizations trade unused IPv4 addresses, delaying total exhaustion. It is not suitable because of its exhaustion and with the current technology more IP addresses are required hence IPv4 would be exhausted very soon, global policy shift is being effected by some countries requiring IPv6 be used.