I find AND-ing a confusing concept in subnetting and I was wondering if it's necessary or not. To find the subnet where a host address lives on, we simply turn off all host bits and find the subnets as multiple of last subnet bit. The subnet where our host lives on is the subnet where the host range includes our host, right?
Example: Host address 10.17.2.14/18 Class A, so turning off all hosts bits will give us the subnets as multiple of 64. That is, 10.17.0.0; 10.17.64.0 etc. Since in 10.17.2.14 number 2 is in the range of the subnet 0 (0 to 64) then the answer is: Our host lives on subnet 0: 10.17.0.0
new guy :)