Kast et blik på Open Ports, freeware
"DiamondCS OpenPorts is a CLI (command line interface/console) tool that allows you to see all open TCP and UDP ports on your system, including the owner process. Using advanced port-to-process mapping technology developed for Port Explorer, OpenPorts is powerful, accurate, and reliable, and results can be displayed in five different styles, allowing for easy interpretation by both scripts and human eyes."
http://www.diamondcs.com.au/openports/Eller Port Explorer, shareware
"Port Explorer allows you to see all the open ports on your system and what programs own them (called Port to Process mapping). Along with this ability it also has many tools including a packet sniffer, bandwidth throttling and country detection to name just a few. Port Explorer has an intuitive GUI that allows you to quickly see all the network activity your computer is involved in, and thanks to its ease of use is allowing people everywhere to do advanced network activities."
http://www.diamondcs.com.au/portexplorer/