IPv4 (Internet Protocol version 4) is a protocol for unique addressing of nodes in a network and, at the time of writing, it has defined all of the IP addresses assigned globally. The limited availability of address space required the development of IPv6 (Internet Protocol version 6), which is to replace the former standard. With a different IP-address structure, IPv6 provides for a greater range of IP addresses and thus increases the possible number of participants in networks worldwide.
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