How do I find out what program is using what port?

Hi
I would like to know what program is using what port? I would also like to know how to close a port. I did a port scan and these ports were open:
Open TCP Port: 1033 netinfo-local
Open TCP Port: 20221
Open TCP Port: 20222 ipulse-ics
Open TCP Port: 20223
Open TCP Port: 20224
Open TCP Port: 20225
Open TCP Port: 20226
Open TCP Port: 20227
Open TCP Port: 20228
Open TCP Port: 47807
I am using netbarrier on my computer.
Thank you for your help.
iBook G4 Mac OS X (10.4.8)

This document may help with your first question:
"Well known" TCP and UDP ports used by Apple Software Products
This IANA listing of the port numbers is also useful, if more detailed.
You can use the Sharing tab of System Preferences to configure the firewall to block all ports except for those specified; you can use the command-line ipfw utility to set up more detailed firewall configurations.
Matt

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How do I find out what program is using what port?

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