/ 
Net-Subnets-1.01
/ Net::Subnets

NAME

Net::Subnets - Computing Subnets In Large Scale Networks

SYNOPSIS

use Net::Subnets;
my $sn = Net::Subnets->new;
$sn->subnets(\@subnets);
if (my $subnetref = $sn->check(\$address)) {
    ...
}
my ($lowipref, highipref) = $sn->range(\$subnet);
my $listref = $sn->list(\($lowipref, $highipref));

DESCRIPTION

Very fast matches large lists of IP addresses against many CIDR subnets and calculates IP address ranges.

This is a simple and efficient example for subnet matching:

use Net::Subnets;

my @subnets   = qw(10.0.0.0/24 10.0.1.0/24);
my @addresses = qw/10.0.0.1 10.0.1.2 10.0.3.1/;

my $sn = Net::Subnets->new;
$sn->subnets(\@subnets);
my $results;
foreach my $address (@addresses) {
    if (my $subnetref = $sn->check(\$address)) {
        $results .= "$address: $$subnetref\n";
    }
    else {
        $results .= "$address: not found\n";
    }
}
print($results);

This is a simple example for range calculation:

use Net::Subnets;

my @subnets = qw(10.0.0.0/24 10.0.1.0/24);

my $sn = Net::Subnets->new;
my $results;
foreach my $subnet (@subnets) {
    my ($lowipref, $highipref) = $sn->range(\$subnet);
    $results .= "$subnet: $$lowipref - $$highipref\n";
}
print( $results );

This is a simple example for list generation:

use Net::Subnets;

my $lowip  = '192.168.0.1';
my $highip = '192.168.0.100';

my $sn = Net::Subnets->new;
my $listref = $sn->list(\($lowip, $highip));
foreach my $address (@$listref) {
    # do something cool
}

METHODS

new

my $subnets = Net::Subnets->new;

Creates an "Net::Subnets" object.

subnets

$subnets->subnets([qw(10.0.0.0/24 10.0.1.0/24)]);

The C<subnets> method lets you prepare a list of CIDR subnets.

check

my $match = $subnets->check(\$address);

The C<check> method lets you check an IP address against the previously
prepared subnets.

range

my ($lowest, $highest) = $subnets->range(\$subnet)

The C<range> method lets you calculate the IP address range of a subnet.

list

my $list = $subnets->list(\$lowest, $highest);

The C<list> method lets you calculate a list containing all IP addresses
in a given range.

AUTHOR

Sebastian Riedel (sri@cpan.org), Juergen Peters (juergen.peters@taulmarill.de)

COPYRIGHT AND LICENSE

Copyright (C) 2003-2010, Sebastian Riedel.

This program is free software, you can redistribute it and/or modify it under the terms of the Artistic License version 2.0.