dhcp leases ‘subnetting the network’

Hi,
I have a Redhat6.2 server with 4 network cards, I would like each nic to serve a particular subnet through dhcpd.
Is it possible to specify which card will supply which subnet or would I have to use groups?
From what I can see dhcpd will merely assign an IP address when requested and will not care (or know) on which nic the request originated.
Thanks
Ian