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When adding network rules, specify addresses in Classless Inter-Domain Routing
(CIDR) format. A CIDR address includes an IPv4 32-bit or IPv6 128-bit IP address,
plus information on how many bits are used for the network prefix. You can use the
asterisk wildcard character (*) or an IP address with a netmask to indicate a range
of IP addresses. For those bits not used, the corresponding bits in the IP address
must be zero. For example, to match an IPv4 Class C subnet, the last octet must
be zero and the mask must be 24. The IPv6 shorthand notation (::) for compressing
successive zeros is not supported. Instead, use the full representation of the IP
address.
https://symwisedownload.symantec.com/resources/sites/SYMWISE/content/live/DOCUMENTATION/7000/DOC7170/en_US/SDCSSA_Prevention_Policy_Reference_Guide.pdf?__gda__=1431632077_72240ef32ee66f772141f0c93f4d7503