IPv6:-

          IPv6 is the latest level of the Internet Protocol and is now included as part of the IP support in many products including the major computer operating systems. IPv6 is a set of specifications from the Internet Engineering Task Force (IETF). IPv6 was designed as an evolutionary set of improvements to the current IP version 4.

          The most obvious improvement in IPv6 over the IPv4 is that IP addresses are lengthened from 32 bits to 128 bits. This extension will take care of future growth of the Internet. The 128 bit address is divided in to 16 bits, and each 16 bit block is converted to a 4 digit hexadecimal number and separated by colons.