As we know the Class A network address has 24 bits available for host addressing. This means we can use up to 22 bits for subnetting.
The process of subnetting a Class A network is pretty much the same as it is for a Class B.
Let’s start :
Example as follows
10.0.0.0 = Network Address
255.128.0.0 = Subnet Mask
Now we are applying top 5 formulas to find out subnets, hosts, valid subnets, broadcast address.
How many subnets?
Formula is : 2x = number of subnets. x is the number of masked bits, or the 1s. Because 128 is 1 bit on (10000000), the answer is 21=2
How many hosts per subnet?
Formula is : 2Y-2 = number of hosts per subnet. y is the number of unmasked bits, or the 0.
We have 23 host bits off (10000000.00000000.00000000), so the equation is 223-2 = 83,88,606 hosts (83,88,608-2).
What are the valid subnets?
Formula is : 256-subnet mask = block size, or increment number.
So, 256-128=128. Remember, we'll start at zero and count in our block size, so our subnets are 0, 128.
Like wise you can make subnetting of all class A IP addresses.
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