Nortel 5650 stack of switches - find IP plugged into a specific port

I have a stack of Nortel 5650 switches.  We currently have a single, flat network, but will be breaking out traffic accross multiple VLANs in the near future.  
I am looking for a way to identify which physical port on the switch is associated with particular IP addresses (i need to move the majority of the ports to a different VLAN, but dont want to move any network devices, printers, etc).

i have been able to find a few statically assigned IP addresses by viewing the arp cache - but that is not working for all.
What is the best way to do this?  
thanks
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Briguy_572Asked:
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gheistCommented:
You can find MAC connected to port, then you can find IP like http://www.experts-exchange.com/Networking/Q_20279274.html
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Briguy_572Author Commented:
i ended up just pinging the IP - and that was enough to force it to populate the arp cache.  I thought i had tried that before i posted the question.  thanks for your help.
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gheistCommented:
Machine can have MAC on port but no IP.
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Rick_O_ShayCommented:
A tool like Solarwinds IP tracker can help to show what addresses are in use and what DNS names are assigned to those addresses and in some case the device type. You would still need to use ARP to map them to the mac addresses and then the switch's FDB to map the macs to ports.
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gheistCommented:
Unic equivalent of IP tracker is arpwatch
When you get IP conflict you look where abuser is connected.
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