I've never gotten around to doing this programaticaly, but I suspect that one of the following modules (or a combination)
might maybe do what you're looking for. I've sorted the following list with what looks to be more promising modules first:
Wish I could provide more concrete help, but I hope this is beneficial in some small way. %^P
striving toward Perl Adept
(it's pronounced "why-bick")
Update: Fwiw, I found these modules through http://search.cpan.org using these terms: netmask, subnet, ip address, and cidr.
Update II: Anonymonk provides below what was beginning to percolate into my brain - that is, convert the dotted quad addresses to their (real) binary values, then sort and look for sequential blocks. ++anonymonk.
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