Hence, IPv6 representation is known as colon-hexadecimal format. IPv6 Address Syntax Unlike IPv4 where 32 bit addresses are divided along 8 bit boundaries, which is converted to its decimal equivalent and represented as a dotted decimal format, in IPv6 the 128 bit address is divided along 16 bit boundaries and each 16 bit block is then converted to a 4 digit-hexadecimal number separated by colons. This number of addresses is large enough to configure a unique address on every node in the Internet and still have plenty of addresses left over. Although improvements have been made in IPv4 to extend the use of protocol, but, address exhaustion is inevitable. The number might seem very large, but it is not enough to sustain the current growth of the internet. With its 32-bit address format, IPv4 can handle a maximum 4.3 billion unique IP addresses. IPv6 is the replacement Internet protocol for IPv4.
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