dhcpd reservations by device type.

Because of several factors too long to list here we have every single machine in our environment on a reserved DHCP lease, what I wanted to know is if you can assign a pool based on the first few bits of a mac address?

For instance, all my supermicro servers start with "53:12:5B:". Do you know if you can set up a dhcpd pool with say 50 addresses that are reserved for any device that matches the first few bits in the mac address?

*edit because words.

https://technet.microsoft.com/en-us/library/dd759190(v=ws.11).aspx<---- this. How do I do this with dhcpd?