Subnetting

Subnetting

Just remember the 128 and divide it to half  untill you get 1.
128  64 32 16 8 4 2 1

If we want to create and IP we must
use a combination with the numbers below so the sum of those numbers must give us the number we want.

Every number can use 8 bits to represent the sum we need. So every number is like _ _ _ _ _ _ _ _
This is 1 octet.
For the creation of an IP we must use 4 Octets separated with . (dot)

The IP will be like that _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _ . _ _ _ _ _ _ _ _

Lets say that we want to create the IP 192.168.1.1

for 192 we will use the 1st Octet .So for the number 192 we need to plus 128+64 .As you can see, the first 2 places represent the number 128 and 64.We will mark the digit 1 at the first 2 places of the Octet and for the rest we will put zero. So        
 1     1   0   0  0  0 0 0
128 64 32 16 8  4 2 1

For number 168 we need numbers 128+32+8 which sum giving us 168 so
   1   0   1   0  1 0 0 0                                                          
128 64 32 16 8 4 2 1

For 3rd and 4th  octet  we need a sum 1 so we need only the last bit. So
 0     0   0   0  0 0 0 1
128 64 32 16 8 4 2 1

All those octets in order giving us the IP 192.168.1.1 which is very common at home routers.Full IP is look like that  11000000.10101000.00000001.00000001