How about this?
http://www.download.com/Active-Ports/3000-2085_4-10062969.htmlActive Ports - easy to use tool for Windows NT/2000/XP that enables you to monitor all open TCP/IP and UDP ports on the local computer.
Active Ports maps ports to the owning application so you can watch which process has opened which port. It also displays a local and remote IP address for each connection and allows you to terminate the owning process. Active Ports can help you to detect trojans and other malicious programs.