The following command adds an IP range of 4.4.0.0 with a mask of 16:

Note: The mask parameter is the netmask.
curl -k "https://bal:1fourall@20.200.25.100/access/addip?ip=4.4.0.0&mask=16"

Response:

<?xml version="1.0" encoding="ISO-8859-1"?>
<Response stat="200" code="ok">
<Success>IP range added</Success>
</Response>

Situation after Add:

To show the default settings of the IP range just added, run the listips command.

<Response stat="200" code="ok">
<Success>
<Data>
<IPAddress>
<Index>1</Index>
<Used>Y</Used>
<Ip>4.4.0.0</Ip>
<IPAddress>4.4.0.0</IPAddress>
<Mask>16</Mask>
<Country>-1</Country>
<IsCustom>N</IsCustom>
<CustomLocation>0</CustomLocation>
</IPAddress>
</Data>
</Success>
</Response>