Problems with checkdnsrr()

[nicdp]

Why does checkdnsrr() fail on the domains:
- globalbm.it
- manzoni.it
These are existing domains.

The script I used is:

$domain = "globalbm.it";
$domain1 = "www.".$domain;
$check1 = checkdnsrr($domain1, ANY);
$check2 = checkdnsrr($domain, ANY);
if (!$check1 and !$check2) { 
 echo "CHECK FAILED on globalbm.it"; 
 }

$domain = "manzoni.it";
$domain1 = "www.".$domain;
$check1 = checkdnsrr($domain1, ANY);
$check2 = checkdnsrr($domain, ANY);
if (!$check1 and !$check2) { 
 echo "CHECK FAILED on manzoni.it"; 
 }

$domain = "vogliounsito.it";
$domain1 = "www.".$domain;
$check1 = checkdnsrr($domain1, ANY);
$check2 = checkdnsrr($domain, ANY);
if (!$check1 and !$check2) { 
 echo "CHECK FAILED on vogliounsito.it"; 
 }