Of course you want the range to not include your FOG Server’s IP, so maybe just +1 form the fog server’s IP and up would work.
Our fog server is not the only static IP we have, we have 20 or so network printers, 5 servers, probably 20 or 30 switches, network connected battery backups, and 20 to 25 regular desktops that are static.
our subnet range is 10.2.0.0 to 10.2.15.254
Our DHCP range is 10.2.3.0 to 10.2.12.255 and the edges that arent’ included are purposely reserved for static IPs.
Of course not everyone uses BOTH edges, but we do. I think the default range should be displayed to the user during the installer, and the user can accept it, or define their own range if they would like, just like other fog options are set up.