I combined my range-to-CIDR with runrig's solution to come up with (tye)Re2: Net::CIDR::Lite ?? (Merge CIDR addresses) that does your nm5.in in under 3 seconds (on my computer), can handle addresses with more than 4 octets, and uses bit-wise operations on strings (which makes it a rather Perlish solution). runrig's method of merging ranges is also rather Perlish.

        - tye (but my friends call me "Tye")

In reply to (tye)Re2: Challenge Problem: Merging Network Addresses by tye
in thread Challenge Problem: Merging Network Addresses by Dominus

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