Keeping in mind that I do no admin'ing (system/network or otherwise) whatsoever, I haven't a clue what would make my Net-CIDR-Lite more useful or correct to those that might want to use it for some practical purpose, and probably ought to give it away to someone who knows/cares more about such things. I read in one place that the net mask should be a number from 8-32, and I see in my code I allow it to be 2-32 and I have no recollection why I started at 2. And then someone emailed me that I should allow '0.0.0.0/0' because its a catch-all address that is useful. Wikipedia says I should allow 0-32, so I guess it ought to be ok to change it. And just changing '2' to '0' in the code doesn't seem to introduce any horrible side effects :-)
Another issue in the same email was that the module dies on error from bad input, and that it ought to instead return undef and have some error code (from a package variable or method). At first I said that an option to do that would be ok, but now that I think about it, it really just introduces useless cruft, and if you really wanted to, you could write a wrapper module to do that. The requestor was under the misguided notion that 'eval' was bad, and didn't know that 'eval { BLOCK }' is idiomatic perl exception catching.
use Carp 'verbose';.