NAME

       Net::CIDR::Lite - Perl extension for merging IPv4 or IPv6 CIDR addresses

SYNOPSIS

         use Net::CIDR::Lite;

         my $cidr = Net::CIDR::Lite->new;
         $cidr->add($cidr_address);
         @cidr_list = $cidr->list;
         @ip_ranges = $cidr->list_range;

DESCRIPTION

       Faster alternative to Net::CIDR when merging a large number of CIDR address ranges. Works
       for IPv4 and IPv6 addresses.

METHODS

       new()
            $cidr = Net::CIDR::Lite->new
            $cidr = Net::CIDR::Lite->new(@args)

           Creates an object to represent a list of CIDR address ranges.  No particular format is
           set yet; once an add method is called with a IPv4 or IPv6 format, only that format may
           be added for this cidr object. Any arguments supplied are passed to add_any() (see
           below).

       add()
            $cidr->add($cidr_address)

           Adds a CIDR address range to the list.

       add_range()
            $cidr->add_range($ip_range)

           Adds a hyphenated IP address range to the list.

       add_cidr()
            $cidr1->add_cidr($cidr2)

           Adds address ranges from one object to another object.

       add_ip()
            $cidr->add_ip($ip_address)

           Adds a single IP address to the list.

       add_any()
            $cidr->add_any($cidr_or_range_or_address);

           Determines format of range or single ip address and calls add(), add_range(),
           add_cidr(), or add_ip() as appropriate.

       $cidr->clean()
            $cidr->clean;

           If you are going to call the list method more than once on the same data, then for
           optimal performance, you can call this to purge null nodes in overlapping ranges from
           the list. Boundary nodes in contiguous ranges are automatically purged during add().
           Only useful when ranges overlap or when contiguous ranges are added out of order.

       $cidr->list()
            @cidr_list = $cidr->list;
            $list_ref  = $cidr->list;

           Returns a list of the merged CIDR addresses. Returns an array if called in list
           context, an array reference if not.

       $cidr->list_range()
            @cidr_list = $cidr->list_range;
            $list_ref  = $cidr->list_range;

           Returns a list of the merged addresses, but in hyphenated range format. Returns an
           array if called in list context, an array reference if not.

       $cidr->list_short_range()
            @cidr_list = $cidr->list_short_range;
            $list_ref  = $cidr->list_short_range;

           Returns a list of the C subnet merged addresses, in short hyphenated range format.
           Returns an array if called in list context, an array reference if not.

           Example:

                   1.1.1.1-2
                   1.1.1.5-7
                   1.1.1.254-255
                   1.1.2.0-2
                   1.1.3.5
                   1.1.3.7

       $cidr->find()
            $found = $cidr->find($ip);

           Returns true if the ip address is found in the CIDR range. False if not.  Not
           extremely efficient, is O(n*log(n)) to sort the ranges in the cidr object O(n) to
           search through the ranges in the cidr object.  The sort is cached on the first call
           and used in subsequent calls, but if more addresses are added to the cidr object,
           prep_find() must be called on the cidr object.

       $cidr->bin_find()
           Same as find(), but forces a binary search. See also prep_find.

       $cidr->prep_find()
            $cidr->prep_find($num);

           Caches the result of sorting the ip addresses. Implicitly called on the first find
           call, but must be explicitly called if more addresses are added to the cidr object.
           find() will do a binary search if the number of ranges is greater than or equal to
           $num (default 20);

       $cidr->spanner()
            $spanner = $cidr1->spanner($label1, $cidr2, $label2, ...);

           Creates a spanner object to find out if multiple ip addresses are within multiple
           labeled address ranges. May also be called as (with or without any arguments):

            Net::CIDR::Lite::Span->new($cidr1, $label1, $cidr2, $label2, ...);

       $spanner->add()
            $spanner->add($cidr1, $label1, $cidr2, $label2,...);

           Adds labeled address ranges to the spanner object. The 'address range' may be a
           Net::CIDR::Lite object, a single CIDR address range, a single hyphenated IP address
           range, or a single IP address.

       $spanner->find()
            $href = $spanner->find(@ip_addresses);

           Look up which range(s) ip addresses are in, and return a lookup table of the results,
           with the keys being the ip addresses, and the value a hash reference of which address
           ranges the ip address is in.

       $spanner->bin_find()
           Same as find(), but forces a binary search. See also prep_find.

       $spanner->prep_find()
            $spanner->prep_find($num);

           Called implicitly the first time $spanner->find(..) is called, must be called again if
           more cidr objects are added to the spanner object. Will do a binary search if ratio of
           the number of ip addresses to the number of ranges is less than $num percent (default
           4).

       $spanner->clean()
            $clean_address = $spanner->clean($ip_address);

           Validates and returns a cleaned up version of an ip address (which is what you will
           find as the key in the result from the $spanner->find(..), not necessarily what the
           original argument looked like). E.g. removes unnecessary leading zeros, removes null
           blocks from IPv6 addresses, etc.

CAVEATS

       Garbage in/garbage out. This module does do validation, but maybe not enough to suit your
       needs.

AUTHOR

       Douglas Wilson, <dougw@cpan.org> w/numerous hints and ideas borrowed from Tye McQueen.

COPYRIGHT

        This module is free software; you can redistribute it and/or
        modify it under the same terms as Perl itself.

SEE ALSO

       Net::CIDR.