Oce VarioLink 2221 User Manual page 365

Various settings
Note
The rejection setting is given priority when the same address range is
specified by both Allow Address Area and Refuse Address Area.
When the Allow Address Area setting is enabled, the address area that is
not specified is specified as the rejection setting.
For DNS server and DHCP server sending and receiving, the IP Filtering
setting is not applied.
When allowing (not allowing) a single IP address, the three methods
described below can be specified.
Enter the IP address in the start address and leave the end address
empty. For example, "192.168.11.22 - empty").
Leave the start address empty and enter the IP address in the end
address. For example, "empty - 192.168.11.22").
Enter the same IP address in the start address and the end address. For
example, "192.168.11.22 – 192.168.11.22").
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