Trace a particular MAC address

Hi
I run an apple network and I have a device somewhere on my network with the same IP address as my router! I know the MAC address (00:1e:52:7e:c2:31) of the rogue device, which I know is an Apple product - how can I find out what it is?
Please help if you can.
Thanks

95% of the clients are Apple machines. The server is a PowerPC G5 running Tiger. We use a wireless system from a company called Meru. Currently, this wireless network is not password protected, but it could be. DHCP is used to dish out IP addresses. All traffic goes through a Proxy Server (Squid) and it is this box that is reporting a conflict of IP addresses- something with the same IP as the router! I have the MAC address of the rougue, but it would be helpful to know what I am looking for - iPhone, iMac, iPod touch.....
Hope this helps.
Anthony

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"is there any permanent solution to override pxe aborted ,even systems are known to SCCM ,we are in sccm 2012 infrastructure"
I think there is not a permanent solution.
It could help if you first run the configuration manager report to locate a particular MAC address.
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Go to System Preference -> Network -> Advanced -> Hardware

It's also available in System Information, under the Network section.
Hold down option and select System Information from the Apple menu.
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just type show cam it will clearly tell where the mac-address is residing.
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Cat6509> (enable) sh cam 00:02:B3:87:EA:10
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hope this helps,
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Trace a particular MAC address

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