IPv4 (Internet Protocol version 4) and IPv6 (Internet Protocol version 6) are addressing schemes that define how devices on a network are identified. IPv4, the earlier and more widely used version, employs a 32-bit address format, allowing for approximately 4.3 billion unique addresses. With the rapid growth of internet-connected devices, IPv4 addresses have become scarce. IPv6, introduced to address this limitation, utilizes a 128-bit address format, providing an astronomically larger pool of unique addresses, making it capable of accommodating the growing number of devices in the modern internet landscape. IPv6 is designed to offer improved security and efficiency compared to IPv4, ensuring the continued expansion of the internet and the connectivity of a vast array of devices. The transition from IPv4 to IPv6 is ongoing to support the increasing demand for IP addresses and sustain the growth of the interconnected world.