Nmap (N etwork Map per) scans over those ports telling you everything from what software is running to what version it is. There is even an option to determine the operating system.

Hi I'm looking for an online port scanner that lets me give it an IP and list of ports, and tells me if ports are filtered or closed. (like how nmap mentions filtered or closed) GRC shields up ...

However for some reason my router locked up during the scan. This happened every time the scan was run. I wasn't able to send or receive from the lan to the wan or vice versa.