use strict;
use warnings;
use Net::IP;
use Net::DNS;
my $ip = new Net::IP($ARGV[0],4);
print $ip->reverse_ip()."\n";
print "Resolving ...\n";
my $res = Net::DNS::Resolver->new;
my $answer = $res->query($ip->reverse_ip(),'PTR');
my $namer = $answer->{'answer'}[0];
if ($namer->{'ptrdname'}) {
	print "PTR Name: $namer->{'ptrdname'}\n";
} else {
	print "N/A\n";
}