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How to calculate Subnets

            CALCULATING NETWORK ID ON FINGERTIPS This is a very simple technique which you will never find in any other sites or books, While attempting any exams we are asked to Calculate the Network id of the given IP. It's not a recommended way to use pen, book and calculations to find out the Ans. SO, Here come's a simple Formula to calculate that within seconds. *********************************************************************************************************** *As the General subnets we can do easily, But this process is very useful in calculating subnets such as   192.168.2.181/30      * *  ==> The network ID of the subnet is 192.168.2.180 we can calculate that in less than 7 seconds with this method                  * *********************************************************************************************************** Follow the steps below: 1) Identif...

IP Subnetting

                                      IP SUBNETTING General way of sub-netting: In this way we will be using two different formulas for calculating sub-networks and Hosts. Calculating Subnets: Example 1: IP: 172.16.0.1/18                                             X.X.11000000.00000000 Formula for calculating subnetworks is 2^n  (2 to the power of n). n = The number of bits used for Networks. Note: as the first two octets 8+8 = 16 bits have been filled completely we should not consider them. The remaining two bits only we should consider for calculating subnetworks. Hence,  n= 2. Number of subnets is = 2^2 = 4 4 subnets. They are: 172.16.0.0/18      -  172.16.63.0/18 172.16.0.64/18    - ...