DHCP Server Generating BAD Address

Dear All,

I've configured a DHCP server on one of the Servers. The DHCP server is working pretty fine but have a major issue like in the leases the Server is generating lot of "BAD_ADDRESS" which is making the DHCP address as full.

IMP: The strange thing is the MAC of the machine where bad address is actually 8 Bits (51e6a8c0). 

Things Done: Tried changing conflict detection as 1 on the DHCP server. Checked with Netscanner for any finding the mac address but in vain i'm unable to find the issue exactly.

Any suggestions on this would be of great help as the scope is getting filled up within few minutes and this is hitting very badly.

Thanks

Shashi Kumar G