Well, in my case it was because I was a little uncertain of what the various classes meant. This was my pre-university days before I studied networks formally.

Well, in my case it was because I was a little uncertain of what the various classes meant. This was my pre-university days before I studied networks formally. My first router could only do the 192.168 range so I got in the habit of it. Later with subsequent routers, all my devices were already set up on a specific class C network, so it was easier to change the router than go through all the devices and change them.