Subnetting

I'm having a hard time finding some good tutorial online regarding subnetting. I know a lot of people just memorize the tables, but I want to actually understand the math behind the architecture. I have to know how to do this manually.

Any advice? I know how to do some things, but I'm always looking for a better way.

I'm not too sure what you mean by "manual", but Cybrary.IT videos on net+ explained how to manually calculate the subnet. Or something like that, I can't quite remember. I don't understand it at all. thumbs up

What is the network address for the 154.24.67.147/22 host?

I understand the binary math, but I need to solve these a lot quicker than I am.

UPDATE

128 64 32 16 8 4 2 1

CIDR notation is /22 = 11111111.11111111.11111100.00000000 = 255.255.240.0

240 is the 6th bit of that octet, so i calculated multiples of 2 starting with 4

4 8 16 32 64 128

Network address is: 154.24.64.0

Check this out http://www.computerweekly.com/news/1280099507/How-to-subnet-Subnetting-calculations-and-shortcuts

The binary math is simple; I'll just memorize the following table:

http://doc.m0n0.ch/quickstartpc/intro-CIDR.html