Correct Answer: 128 bits
Explanation:
IPv6 - Internet Protocol Version 6.
IPv6 addresses have a size of 128 bits.
Internet Protocol Version 6 [IPv6] is the successor to the Internet's first addressing infrastructure, Internet Protocol version 4 (IPv4).
In contrast to IPv4, which defined an IP address as a 32-bit value, IPv6 address have a size of 128 bits.
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