The thing about 192.168.0.1 - 192.168.0.100 is that it is impossible to represent that exact range in one net block. You have to use several netblocks of varying sizes to do it. So no, Net::Netmask will not let you do it all in one block because its impossible.
It does, however, give you the range2cidrlist method that will break that range into a series of valid netblocks for you.
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