IPv4, the most widely used IP address format, has approximately 4.3 billion possible addresses, and most of these have already been allocated worldwide due to the huge number of connected devices. This shortage led to the development of IPv6, a newer format offering an extremely large number of unique addresses, enough to assign one to essentially every device that could ever exist. Most networks now support both IPv4 and IPv6 simultaneously, helping manage the transition. While IPv4 addresses are effectively exhausted and often reused or shared between multiple devices, IPv6 provides more than enough capacity for the foreseeable future of internet-connected devices.

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