How many bits are used for addressing with IPv4 and IPv6, respectively? Infrastructure and Connectivity How many bits are used for addressing with IPv4 and IPv6, respectively? a. 32, 128 b. 16, 64 c. 8, 32 d. 4, 16 Answer: A IPv4 uses 32 bits for the host address, while IPv6 uses 128 bits for this. Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+