Setting up a switch in class..crashed and burned

Image above "Redneck networking" :P

In this lab we had to Set up a network on a switch using 160.20.0.0 with a subnet mask 255.255.240.0

4 bits are being used by this network.
Our task was to set up our IP’s on the 4^th subnet I was assigned #7 on this range.
At first I made a huge mistake when I got the end range in the 3^rd range I excluded one of the host bits. So what I did was 0011 1111.11111110 this gave me 160.20.63.254 as my end range & 160.20.63.255 as the broadcast for this range. So with these figures I started the 4^th range with 160.20.64.0…WRONG. What I should have done was not include the Host part into the end range here what it should have looked like 0010 1111.11111110 this would have gave me 160.20.47.254 for my end range & 160.20.47.255 for my broadcast. With 160.20.48.0 as the correct 4^th subnet. Once I had the correct subnet number I had to set up my PC with the proper IP. To do this I had to go to start/settings/network connections/properties on my LAN/ properties IPV4.

See image below

Once I got my IP set up I had to ping the rest of the class, (to do this open command prompt and type ping IP number you wish to ping should look like this 160.20.48.3) but for some reason they were not able to ping me, even though my firewall was off. My teacher looked over my settings and didn’t find anything wrong. He suggested a reboot, but this still did not fix the problem. I was never able to find out why the rest of my class was unable to ping me.