MAC address mapping

[cowtown]

Hello,

I am seeking a solution to flush out a unknown mac address.
I have over 200 free statically assigned ip addresses that
have the same mac address mapped to them, thus preventing me from utilizing these free addresses. This is occuring on two different interfaces.

10.10.100.100 00e0.7b03.2ca0 fa0/1
10.10.100.101 00e0.7b03.2ca0 fa0/1
10.10.100.102 00e0.7b03.2ca0 fa0/1

10.20.100.10 00e0.7b03.2ca1 fa0/0
10.20.100.11 00e0.7b03.2ca1 fa0/0
10.20.100.12 00e0.7b03.2ca1 fa0/0

Is this occuring with anyone else?
Can this unknown mac address be flushed off my network?

Thanks,

CT