IPv6 addresses are 128 bits long and are represented as a string of hexadecimal digits. A single hexadecimal digit can represent every four bits, for a total of 32 hexadecimal values (016 [00002] through f16 [11112]).
IPv6 addresses are classified into three types: unicast, anycast, and multicast. Unicast addresses are used to identify a single interface. Anycast addresses identify a group of interfaces so that a packet sent to an anycast address is delivered to a member of the group. An IP address is typically written in decimal digits, separated by periods, and formatted as four 8-bit fields. Each 8-bit field corresponds to one byte of the IP address. The dotted-decimal format is a common way of representing the bytes of an IP address.
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