D-Link DI-106 Series User Manual page 26

you assign. Unless you have special need for subnetting, use
the default mask as calculated by the router.
The table below lists some examples of IP subnet masks and the
number of hosts that are allowed. Consult your network
administrator if you are unsure of this value.
IP Subnet Mask
255.255.255.0
255.255.255.128
255.255.255.192
255.255.255.224
255.255.255.255
18
Number of Host IDs
254
126
62
30
1
Number of Bits
24
25
26
27
32
Before You Begin