You can add a range of IPs in Cpanel/WHM .This can be easily done using the WHM interface:
Go to IP Functions/Add a New IP Address. Here you can choose the “Ip(s) to add” and the Subnet Mask.
To add the IP range 192.168.0.100-192.168.0.105 you will just have to enter:
Ip(s) to add: 192.168.0.100-105
Subnet Mask: 255.255.255.0
and click on “Do it“.
This will add all the IPs in the range to the system.
In the background CPanel will add for each IP a line in the file /etc/ips:
#vi /etc/ips
192.168.0.100:255.255.255.0:192.168.0.255
192.168.0.101:255.255.255.0:192.168.0.255
...etc
The IPs are then configured using the CPanel startup script called ipaliases (/etc/init.d/ipaliases).
#service ipalias restart
