use 5.010;
use Data::Dumper;
use XML::LibXML 1.70;

my $xml = XML::LibXML->load_xml(IO => \*DATA);
my @results;
foreach my $dict ($xml->findnodes('//dict'))
{
    my $key = $dict->getAttribute('key');
    next unless $key ~~ [qw( subnet gateway cidr netmask )];
    push @results, {} if $key eq 'subnet';

    my $value = $dict->findvalue('.//value');    
    $results[-1]{ $key } = "$value";
}

print Dumper \@results;


__DATA__
<root>
 <dict key="status">
 <value>success</value>
 </dict>
 <dict key="data">
 <list>
 <dict key="subnet">
 <value>10.11.14.0</value>
 </dict>
 <dict key="gateway"><value>10.11.13.1</value>
 </dict>
 <dict key="cidr"><value>10.11.14.0/21</value>
 </dict>
 <dict key="netmask"><value>255.255.248.0</value>
 </dict>
 <dict key="subnet"><value>10.11.15.0</value>
 </dict>
 <dict key="gateway"><value>10.11.13.1</value>
 </dict>
 <dict key="cidr"><value>10.11.15.0/24</value>
 </dict>
 <dict key="netmask"><value>255.255.255.0</value>
 </dict>
 <dict key="subnet">
 <value>10.15.8.0</value>
 </dict>
 <dict key="gateway">
 <value>10.11.13.1</value>
 </dict>
 <dict key="cidr">
 <value>10.15.8.0/22</value>
 </dict>
 <dict key="netmask">
 <value>255.255.252.0</value>
 </dict>
 <dict key="subnet">
 <value>10.7.17.22</value>
 </dict>
 <dict key="gateway">
 <value>10.11.13.1</value>
 </dict>
 <dict key="cidr">
 <value>10.7.17.224/28</value>
 </dict>
 <dict key="netmask">
 <value>255.255.255.240</value>
 </dict>
 <dict key="subnet">
 <value>10.11.24.0</value>
 </dict>
 <dict key="gateway">
 <value>10.11.13.1</value>
 </dict><dict key="cidr">
 <value>10.11.24.0/24</value>
 </dict><dict key="netmask"
 ><value>255.255.255.0</value>
 </dict>
 </list>
 </dict>
 <dict key="exitCode">
 <value>0</value>
 </dict>
 </root>
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