In case you need to enter many ranges, a quick csv-import interface is available.
csv format:
IP-Range 1 START(semicolon)IP-range 1 END(Linefeed)
IP-Range 2 START(semicolon)IP-range 2 END(Linefeed)
If the end column is empty and the start address contains a broadcast address (e.g. 192.168.54.0), the complete IP-range of the subnet is assumed.