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  1. or download this
    my $name = nslookup(host => $ip, type => "PTR") || $ip;
  2. or download this
    if (!$name_cache{$ip}) {
   $name_cache{$ip} = nslookup(host => $ip, type => "PTR") || $ip;
}

my $name = $name_cache{$ip};