# Asda

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Submitted By heavensevidence
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Class A
In a class A IP address, the first byte represents the network.
The most significant bit (the first bit, that to the left) is at zero which means that there are 27 (00000000 to 01111111) network possibilities, which is 128 possibilities However, the 0 network (bits valuing 00000000) does not exist and number 127 is reserved to indicate your machine.
The networks available in class A are therefore networks going from 1.0.0.0 to 126.0.0.0 (the last bytes are zeros which indicate that this is indeed a network and not computers!)
The three bytes to the left represent the computers on the network, the network can therefore contain a number of computers equal to:
224-2 = 16,777,214 computers.
The first class address to discuss is a class A address, which has a default subnet mask of 255.0.0.0, meaning the first octet is the network ID portion and the last three octets are the host ID portion of the address. This allows for 16,777,214 hosts on the network —a very big network! To calculate how many hosts can exist on the network, you use the formula of 2<# of host bits>.
For example, 12.x.y.z is a class A address with a subnet mask of 255.0.0.0. This means there are 24 bits (the last 3 octets) that make up the host ID portion, so the formula is 224 = 16,777,216. But I said there were 16,777,214 hosts on the network. Is my math wrong? No, after you use the formula to calculate the number of hosts you subtract 2 from it because there are two addresses on every network that you are not allowed to use. You are not allowed to use the address with all host bits set to 0, as that is reserved for the network ID, and you are not allowed to use the address with all host bits set to 1 because that is reserved for the broadcast address, which is the address that a system sends data to when it wants everyone on the network to receive the information. | FOR

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