CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer. For each port in the list, information about the process that opened the port is also displayed, including the process name, full path of the process, version information of the process (product name, file description, and so on), the time that the process was created, and the user that created it.
In addition, CurrPorts allows you to close unwanted TCP connections, kill the process that opened the ports, and save the TCP/UDP ports information to HTML file , XML file, or to tab-delimited text file.
CurrPorts also automatically mark with pink color suspicious TCP/UDP ports owned by unidentified applications (Applications without version information and icons)

#only 36K, freeware, no system changes, download and run
#runs on all windows versions but older versions show less details
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[...] The freeware requires no installation and does not change the system, just run it using the windows run command. Every user that is logged on can use the application, that´s right even guests can use it. Another great tool that uses a gui is Currports. Just follow the link if you like it. [...]
[...] CurrPorts – מציג מי מחובר למחשב בכל רגע נתון.כתבה [...]
[...] similar application with a graphical user interface is Cports. Like such posts? Get updates via RSS NEWS FEED. Love Ghacks? Find out how you can help! [...]
[...] computer software for the Windows platform including some extremely popular applications like CurrPorts which displays the open ports and software programs using them, Wireless Key View which can recover [...]
[...] for the Windows operating system. It is basically an alternative to popular portable application Curr Ports or Open Ports which is also displaying the TCP / IP network connections in realtime. Connection [...]
[...] to regularly check the open ports for computer security reasons. We reviewed CurrPorts (see: Who is connected to your PC right now) a while ago. It is a portable Nirsoft application that will display the open ports along with [...]