Zoom X5V User Manual page 66

IP addr.2 If you are using the Single IP option, this field is not
applicable.
If you are using the IP Range option, enter the end
of the IP address range here. Note: IP addr.1 has to
contain the beginning of the range.
If you are using the Subnet Mask option, enter the
subnet mask here. The subnet mask divides IP
addresses into groups. In the IP addr.1 field, you
must enter an IP address of the group that you want
in the database. All IP addresses within the same
group as the address in the IP addr.1 field will be
affected.
For example, if you enter the IP address 192.168.0.1
in the ip addr.1 field and the subnet mask
255.255.255.0 in the ip addr.2 field, the group will
include the addresses 192.168.0.1 to 192.168.0.255
(for a total of 255 addresses). If you enter the IP
address 192.168.0.1 in the ip addr.1 field, and the
subnet mask 255.255.255.240 in the ip addr.2 field,
the group will include the addresses 192.168.0.1 to
192.168.0.15 (a total of 15 addresses).
Once you have filled in these fields, click Add/Modify this entry.
A new page displays, showing the new entry at the top, with two
buttons Modify and Delete. You can change or delete this entry at
any time. From this page, you can also add new entries.
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X5v
ADSL User's Guide