Why all IP at my office starts with 192.168.x.x?

This is often surprising. Why always that familiar devil 192.168.blah.blah. Search it in any book or even on web and you will not get any good answers. Here the answer in simple non technical words.

A office or small network always has small number of PC. Thus they use a CLASS C IP. For every class, a set of private IP is defined. For class C, it starts with 192.168.x.x. You will never find any Public Ip, that is to say, IP of a website that starts with 192.168.

What? Your office IP starts with 10.x.x.x. It means your office use Class A IP. It also means that your Office network is very large.

How to check IP of your PC. Dude! Use ipconfig (Windows) on command prompt. Ifconfig (linux) on terminal.

To check Public IP of a website ping it. e.g. ping www.whoisnotafool,com.