Canon i-SENSYS LBP6670dn User Manual page 667

You can also enter IP addresses as follows.
Input example of
the IP addresses
fe80::0000/64
NOTE
When "0" is entered in [Prefix Length]
All the IP addresses become the target for rejection or permission.
When "128" 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].
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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 128).
Method for entering IP addresses