group ip ranges

[Ken Appell]

I have a small network with different appliances on it that all connect 
to the same DHCP server to get their IP addresses. In order to simplify 
maintenance, I'd like to group the IP addresses according to appliance 
type. I know my example below doesn't work, but is there another way to 
do it?

thanks,
ken

Example:
....
option subnet-mask              255.255.255.0;
option broadcast-address        192.168.0.255;
option routers                  192.168.0.1;
option domain-name-servers      192.168.0.1;
option ntp-servers              192.168.0.4;
next-server                     192.168.0.4;

subnet 192.168.0.0 netmask 255.255.255.0 {
   authoritative;
   range                        192.168.0.100 192.168.0.119;
}

group {
   use-host-decl-names          on;
   range                        192.168.1.120 192.168.1.129;

   host pc1 {
      hardware ethernet 00:16:ec:cc:ae:0a;
   }

   host pc2 {
      hardware ethernet 00:11:5b:c3:a2:dd;
   }
}

group {
   use-host-decl-names          on;
   option log-servers           192.168.0.4;
   option root-path             "192.168.0.4:/opt/ltsp-4.2/i386";
   filename                     "/lts/2.6.16.1-ltsp-2/pxelinux.0";
   range                        192.168.1.130 192.168.1.139;

   host ltsp1 {
      hardware ethernet         00:b0:d0:da:b3:c8;
   }

   host ltsp2 {
      hardware ethernet         00:b0:d0:da:b3:b5;
   }

   host ltsp3 {
      hardware ethernet         00:40:63:d3:bd:d6;
   }

}