Sub-netting: How to split a network up

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We have our IP address: 192.168.0.1

We also have the Subnet Mask: 255.255.255.0

Binary Subnet Mask: 11111111.11111111.11111111.00000000

                                   Network Bits                        Host Bits

To split the network we need to change the subnet mask by changing the host bits

To create 4 networks out of our existing network 

To do this we need to use a binary conversion chart 

128 64 32 16 8 4 2 1

256 128 64 32 16 4 2 

So if we want 4 networks we need to use 2 bits

So our subnet mask would look like this: 11111111.11111111.11111111.11000000

Converted back into decimal: 255.255.255.192

By counting all the network bits in the network mask the CIDR notation would by /26

Now we need to find our increment which tells us the range of the network in this case its the last network bit which converted is 64.

The First Network

192.168.1.0 - 192.168.1.63

The Second Network

192.168.1.64 - 192.168.1.127

The Third Network

192.168.1.128 - 192.168.1.191

The Fourth Network

192.168.1.192 - 192.168.1.255

All of the networks having the subnet mask of 255.255.255.192

 

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