How to view internet ports currently in use?

I'm trying to upload a file to a video website and it refuses my connection when my router's firewall is active (even though I can browse the web and use FTP services etc). When I set my router so that my computer is in the DMZ (turning off the firewall), it works fine - but I would prefer to keep the computer firewalled and just open whichever ports are needed...
*Is there a program or way to view which ports are currently active/in use through the Mac OS?* I've tried looking at my router log and it isn't that specific.
Thanks a bunch,
Jolyon

Might check out the lsof & netstat commands in the bottom half of this page...
http://www.macos-x-server.com/wiki/index.php?title=NetworkServicePorts

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