Optional. Defaults:

    o  Destination is classified based on its Internet network class
       (A, B, or C).

    o  If the address is clearly a network number, SET ROUTE
       interprets the number correctly.

    Defines the route as a network route.

    Use this qualifier if the network number could be misinterpreted
    as an IP host address; for example, if a network mask is
    nonstandard, or if the IP address is abbreviated.

    This qualifier is required if you are creating a network route
    that specifies a CIDR mask (for example, /MASK=mask_length).