Doing a quick search, it looks like Net::CIDR::Set provides a merge functionality. Also, it provides a few iterators that returns addresses or CIDR blocks in ascending order. With one of the iterators, I think it's possible to make your own sorting subroutine.

In reply to Re: Seeking CPAN module I used once to merge CIDR blocks by dasgar
in thread Seeking CPAN module I used once to merge CIDR blocks by blue_cowdawg

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