IPv6 exists because the Internet ran out of addresses. Every device that connects to the internet needs an IP address. The previous system, IPv4, was built with a fixed limit, and that limit has already been reached. IPv6 was introduced to remove this constraint. It replaces IPv4’s 32-bit addressing system with a 128-bit structure, allowing for an effectively unlimited number of unique addresses.
This shift changes more than scale. It alters how devices are identified, how networks are structured, and how communication happens without relying on shared addresses or workarounds.