The Readme for fport v2.0 contains:

                              fport supports Windows NT4, Windows 2000 and Windows XP                              fport reports all open TCP/IP and UDP ports and maps them to the owning application.                              This is the same information you would see using the 'netstat -an' command, but it also                              maps those ports to running processes with the PID, process name and path.  Fport can be                              used to quickly identify unknown open ports and their associated applications.                              Usage:                                C:\>fport                              FPort v2.0 - TCP/IP Process to Port Mapper                              Copyright 2000 by Foundstone, Inc.                                                  Pid   Process            Port  Proto Path                              392   svchost        ->  135   TCP   C:\WINNT\system32\svchost.exe                              8     System         ->  139   TCP                              8     System         ->  445   TCP                              508   MSTask         ->  1025  TCP   C:\WINNT\system32\MSTask.exe                              392   svchost        ->  135   UDP   C:\WINNT\system32\svchost.exe                              8     System         ->  137   UDP                              8     System         ->  138   UDP                              8     System         ->  445   UDP                              224   lsass          ->  500   UDP   C:\WINNT\system32\lsass.exe                              212   services       ->  1026  UDP   C:\WINNT\system32\services.exe                              The program contains five (5) switches.  The switches may be utilized using either a '/'                               or a '-' preceding the switch.  The switches are;                              Usage:                              	/?	 usage help                                      /p       sort by port                                      /a       sort by application                                      /i       sort by pid                                      /ap      sort by application path                              For updates visit: