Canon LBP7780CX User Manual page 687

You can also enter IP addresses as follows.
Input example of
the IP addresses
192.168.0.1-
192.168.0.10
192.168.0.0/16
NOTE
When "0" is entered in [Prefix Length]
All the IP addresses become the target for rejection or permission.
When "32" is entered in [Prefix Length]
The IP address of the printer becomes the target for rejection or permission.
When deleting a set IP address
(1) Select an IP address you want to delete.
(2) Click [Delete].
If you want to enter the IP addresses of consecutive numbers, place "-" (hyphen) between the
address of the smallest number and that of the largest number.
In order to specify the subnet range (prefix length), enter a "/" (slash) after the normal IP
address symbol, and then enter another prefix length (maximum 32).
Method for entering IP addresses