F-SECURE POLICY MANAGER 8.0, Administrator'S Manual

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D.1 Overview
NSC notation is a standard shorthand notation, which combines a
network address with its associated netmask.
NSC notation defines the number of contiguous one-bits in the netmask
with a slash and a number following the network address. Here is a
simple example:
NSC notation is not compatible with networks that use "comb" style
netmasks, where all one-bits are not contiguous. The following table gives
the number of bits for each permitted netmask.
The .0.0.0/0 is a special network definition reserved for the default route.
Network Address Netmask NSC Notation
192.168.0.0 255.255.0.0 192.168.0.0/16
192.168.1.0 255.255.255.0 192.168.1.0/24
192.168.1.255 255.255.255.255 192.168.1.255/32
Netmask Bits Netmask Bits
128.0.0.0 1 255.128.0.0 9
192.0.0.0 2 255.192.0.0 10
224.0.0.0 3 255.224.0.0 11
240.0.0.0 4 255.240.0.0 12
248.0.0.0 5 255.248.0.0 13
252.0.0.0 6 255.252.0.0 14
254.0.0.0 7 255.254.0.0 15
255.0.0.0 8 255.255.0.0 16