#!/usr/bin/env perl

use strict;
use warnings;
use autodie;

use Data::Dump;
use Text::CSV;

use constant {
    IP => 2,
    URL => 5,
};

my $csv_file = 'pm_11137097_csv_parse.csv';
my %urls_for_ip;

my $csv = Text::CSV::->new();

{
    open my $fh, '<', $csv_file;

    while (my $row = $csv->getline($fh)) {
        push @{$urls_for_ip{$row->[IP]}}, $row->[URL];
    }
}

dd \%urls_for_ip;