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How many bits make up the network portion of a Class A IP address? 8 bits, leaving 24 for the host portion How many bits make up the network portion of a Class B IP address? 16 bits, leaving 16 for the host portion How many bits make up the network portion of a Class C IP address? 24 bits, leaving 8 for the host portion How many addresses are available in a Class A networK?
Note Class A. This was before CIDR. So, the Class A, B and C private address netblocks needed to come out of the correct IP ranges. I know that 172.16.0.0/12 was picked because it offered the most continuous block of Class B (/16) addresses in the IP space that was in a reserved block. know the concept of public IP, private IP ranges and its purpose. But a guy asked me couple of days back why particular range is choosen as private over other. I think its a Randon pick as they wanted to give private range for users(companies) from each class of network.