How do I find rogue IP addresses?

I set up a Windows 2003 DHCP server, but 3 of the addresses are flagged in the DHCP server as BAD ADDRESSES. They show a unique ID in the column where MAC addresses normally show up. The IDs are e50110ac, f70110ac, and e80110ac.

One will respond to pings, the other two dont. If I delete them from the DHCP list they come back as bad addresses again.

How can I find these on the network without a lot of manually searching?
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Eric_PriceAsked:
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omarfaridConnect With a Mentor Commented:
you check arp table after pinging ip and then get mac address, use command

arp -a
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BembiCEOCommented:
Is it possible, that these IPs are printers or other devices like NAS devices or something similar?

The device your can ping, can you resolve the name? (ping -a xxx)
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