Port Checker

Ever wanted to check what ports are open on your pc

Go to : http://www.grc.com/ or  https://www.grc.com/x/ne.dll?bh0bkyd2
then click on the services tab and then sheildsup under that tab.
Now move to the bottom of the page and press proceed.
In the middle of the page click on "All Service Ports" to check the first 1056 ports.


Otherwise download this tool to individually check if a  port is open.  http://www.portforward.com/store/PFPortChecker.exe

Here is a list of commonly used ports : http://portforward.com/cports.htm