Net::Netmask parses and understands IPv4 CIDR blocks. It's built with an object-oriented interface and provides nearly all bits of information about a network block that you might want. There are also functions to put a network block into a table and look it up by IP address, turn an IP address range into a list of CIDR blocks, turn a list of CIDR blocks into a list of IP addresses, and a function for sorting by text IP address.
WWW: http://search.cpan.org/dist/Net-Netmask/
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