Final answer:
IPv6 addresses are written in hexadecimal format, composed of eight groups of four hexadecimal digits separated by colons.
Step-by-step explanation:
Internet Protocol (IP) v6 addresses are written out in C. Hexadecimal Format. Unlike IPv4 which uses dotted decimal notation, IPv6 addresses are denoted using eight groups of four hexadecimal digits, separated by colons. An example of an IPv6 address would be 2001:0db8:85a3:0000:0000:8a2e:0370:7334. This hexadecimal representation helps to manage the larger address space provided by IPv6, which contains 128 bits compared to the 32 bits of IPv4.