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CALCULATING NETWORK ADDRESS OF AN IP ADDRESS: In this Post I will share you a trick to find out, What is the network address of a IP address. In CCNA or JNCIA Exams we get questions like: what is network address of 172.16.12.100/29? what is network address of 192.168.100.100/26? If it's a class-full subnet (/8, /16, /24) we can find it out easily but in case of a subnetted IP address we required some more time to identify the Sub network IP address. Below is a simple 3 steps formula that gives you accurate Sub-network IP address of any given IP: Step-1: Find out how many hosts we get in that subnet:   (Including Network address and Broadcast address) Like, in  192.168.1.0/24 we get 255 Hosts. 192.168.1.0/29  we get 8 Hosts. 192.168.1.0/30  we get 4 Hosts. Below is the chart that explains how many hosts per bit we get: The above Pic represents the 8 Bits in an octet, And no. of hosts per each bit. So, Clearly if we ...

            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 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    - ...