The internet is the one of the greatest revolutionary innovation of the twentieth century.It made the ‘global village utopia’ a reality in a rather short span of time and the ways that computers communicate have, in many cases, changed dramatically. The main problem with IPv4 is its relatively small address space, a legacy of the decision to use only 32 bits for the IP address. The core problem, the 32-bit address space that is too small for the current and future size of the Internet, can only be addressed by moving to a larger address space. To speed up the transition IPV4 compatible IPV6 addressing scheme has been worked out. This was the primary motivating factor in creating the next version of the Internet Protocol, IPv6. IPv6 is destined to be the future of the Internet Protocol, and due to IP's critical importance, it will form the basis for the future of TCP/IP and the Internet as well. it's been under development since the middle of the last decade, and a real IPv6 internetwork has been used for testing for a number of years as well. Many vendors are now writing softwares for various computing environments to support IPV6 functionality.