there is a device using one of my DHCP addresses which I don't know what it is, why, because it's not even listed under my DHCP lease pool. I found out about it when I got a message on a machine saying it has a IP conflig on the network. the service seen that IP as not been used but I can ping it. keep in mind I assign my servers and printer with different and static IPs.
how can I identify this device and hopefully locate it. I do have it's MAC address.