Yes, they do get it from DHCP. But the wierd thing is that in DHCP on my domain controller, these addresses don't show up. Nor do they in DNS.
Sorry.... But just because your domain policy allows for DHCP doesn't mean that I can't connect to your network with a valid IP address... I just need to find an unused one to avoid those pesky "There has been an IP Address conflict" messages.

Check your reservations in case it's that JetDirect printer you put in a year ago or something similar. Then it's time to break out the Ethereal Tutorial, run it and see what you can see.....