Router List
http://www.portforward.com/english/routers/port_forwarding/routerindex.htm
Port List
http://www.portforward.com/cports.htm
Port Checker
http://www.portforward.com/help/portcheck.htm
In other words, with our open port check tool you never get a false positive!
Screenshots and Instructions
After downloading PFPortChecker, you run the installation file to install it on your computer.
Then you run PFPortCheck (located in the Start menu under portforward.com) and type in the port you want to check, and whether you want to check TCP or UDP, and click Check Me.
If it says Your port is OPEN then we are absolutly sure that your port is definitly open. No other port checker can claim that.
If it says Your port is NOT OPEN or not reachable! then we were unable to establish a connection to your computer, which means that most likely either your port is not open or your software firewall is still preventing an inbound connection from being made.