Understanding the basic format of an IPv6 address is important for certification and for the actual implementation of IPv6. A few key details about IPv6 and its format are as follows:
Length: IPv6 addresses are 128 bits (16 bytes) long.
Groupings: IPv6 addresses are segmented into eight groups of four hex characters.
Separation of groups: Each group is separated by a colon (:).
Length of mask: Usually 50 percent (64 ...