Wake on lan

I am not sure if this is a good spot to post this, but here it is.

I am trying to wake up a bunch of PCs (using Wake-on-LAN). These PCs are
DHCP clients and may be on different sub-nets.

All the WOL software I am finding needs both an IP and MAC address. I am
trying to find/create a script which will extract the IP and MAC address
information from DHCP and insert it into a statement to wake up all the PCs
in that subnet.

Does anyone know if a script like this is available or have any suggestions
on creating one?