Compare and Contrast IPv4 and IPv6. Find examples of companies who are currently using IPv6. What are some of the benefits of using IPv6 over IPv4 and vice versa.

IPv4 address field is of 32-bits while the address field of IPv6 is 128-bits. The IPv4 requires a packet size of 576 bytes with optional fragmentation whereas, IPv6 uses 1280 bytes without fragmentation. IPv6 is preferred over IPv4 because of its large address range. IPv4 uses 32-bit source and destination address and we are running out of addresses. To solve this issue, Internet Engineering Task Force has devised a solution by introducing IPv6 which uses 128-bits address field. It is being said that if we convert the water bodies present on earth into deserts and then we assign each particle of desert with an address even then the addresses of IPv6 won't end. IPv6 provides flexible options and extensions. IPv6 provides multi broadcast while, IPv4 just provides broadcast. Internet has switched from IPv4 to IPv6.