IPv4 has lasted for decades because technologies such as NAT, private addressing, and Classless Inter-Domain Routing allowed more efficient use of its limited address space. These techniques enabled many devices to share a single public IP address, slowing address exhaustion. However, IPv4 uses a 32-bit address system that supports only about…

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This is due to the introduction of NAT which allows many devices in a private network to share one public IP address.