Copied from Nirsoft Homepage:


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)


System Requirements

This utility works perfectly under Windows NT, Windows 2000, Windows XP, Windows Server 2003, And Windows Vista. If you want to use this utility on Windows NT, you should install psapi.dll in your system32 directory.
You can also use this utility on older versions of Windows (Windows 98/ME), but in these versions of Windows, the process information for each port won't be displayed.


License
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This utility is released as freeware. You are allowed to freely
distribute this utility via floppy disk, CD-ROM, Internet, or in any
other way, as long as you don't charge anything for this.
If you distribute this utility, you must include all files in the distribution
package, without any modification!


Changelog:


Added drag And drop icon in the toolbar that allows to to easily filter by the desired application. Simply drag the target icon into the window of the application, and CurrPorts will display only the opened ports of this application.