#!/usr/bin/perl

use Net::DNS;
#use IO::Socket::IP;

$testcandidate="cl";


print "IPV4 test...\n";
      $res = new Net::DNS::Resolver;
      $res->tcp_timeout (1) ;
      $res->retry (1) ;
      $res->retrans (1) ;
      $query = $res->nameservers('162.219.53.120');
      $query = $res->query($testcandidate, "SOA");
      print "What's in the array: \n";
      print join ' ', $res->nameservers();
      print "\n";
      my $serial=($query->answer)[0]->serial, if ($query);
      print "serial:  $serial\n";

print "\n\nIPV6 test...\n";
      $res = new Net::DNS::Resolver;
      $res->tcp_timeout (1) ;
      $res->retry (1) ;
      $res->retrans (1) ;
      $query = $res->nameservers('2620:10a:80d1:1053::120');
      $query = $res->query($testcandidate, "SOA");
      print "What's in the array: \n";
      print join ' ', $res->nameservers();
      print "\n";
      my $serial=($query->answer)[0]->serial, if ($query);
      print "serial:  $serial\n";

##</code><code>##

[root@ns01 jzack]# ./snippet 
IPV4 test...
What's in the array: 
162.219.53.120
serial:  2020070925


IPV6 test...
What's in the array: 

serial: