In IPv6, an address is given by eight 16-bit numbers usually written in hexadecimal. For example, here is an IP address:
3221: IDE5: CA14: AD1F: 1111:1111:1111:1111
How many unique addresses does IPv6 support overall?

Correct option is D

An IPv6 address consists of eight 16-bit blocks, typically written in hexadecimal format. Each block contains 16 bits, and there are 8 blocks.
The total number of unique addresses supported by IPv6 is:
655368 = (216)8 = 2128