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Very strange MAC addresses showing up in DHCP bindings

Hi, I have a dhcp pool on a public network and recently there are very strange MAC addresses geting dhcp from the router.

Here is an example:

10.20.2.155         0034.6564.3766.6666.    Nov 21 2011 02:43 PM    Automatic

                    3337.64

and also:

10.20.1.189         004b                    Nov 20 2011 06:07 PM    Automatic

The router is giving out IP's to both DHCP and BOOTP requests.

The IOS is pretty old, c2801-advsecurityk9-mz.124-3g.bin and I will upgrade it in the next fiew days wich will probably fix this issue. I am just curious how a client can use such an erroneus MAC address and get a DHCP binding? Or is this because of a buggy IOS?

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