You can add 0.0.0.1 using the binadd method :

#! perl
use strict;
use warnings;
use Net::IP;

my $one = Net::IP->new('0.0.0.1');
my $ip1 = Net::IP->new('192.168.0.0/24');
my $ip2 = Net::IP->new('172.168.0.0/16');
my $ip3 = Net::IP->new('10.0.0.0/24');

for my $ip ($ip1, $ip2, $ip3)
{
    print "\nStart IP    [", $ip->ip(),        "]\n";
    print   "Start mask  [", $ip->prefixlen(), "]\n";
    $ip->set($ip->last_ip());
    $ip = $ip->binadd($one);
    print   "Next subnet [", $ip->ip(),        "]\n";
}
[download]

Output:

17:41 >perl 629_SoPW.pl

Start IP    [192.168.0.0]
Start mask  [24]
Next subnet [192.168.1.0]

Start IP    [172.168.0.0]
Start mask  [16]
Next subnet [172.169.0.0]

Start IP    [10.0.0.0]
Start mask  [24]
Next subnet [10.0.1.0]

17:41 >
[download]

Hope that helps,

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