One of the most common question is see users asking
How i can find what ports are open on my computer
you can uses NETSTAT command to check what ports
are open on your computer .
netstat -an |find /i "listening"
Listening will show you what ports are open and
if you replace listening with established it will
show you all the ports you have connection established.
netstat -an |find /i "Established"
I still suggest you to use port scanner to
find out what ports are open on your computer.