Get domain from gethostbyaddr?

[norbiu]

IP: 100.100.100.100
Hostname: 100-100-100-100.verizon.net

How do I extract the domain from the host name?

[norbiu]

Found a solution:

$hostname = gethostbyaddr($_SERVER['REMOTE_ADDR']);

$string = $hostname;
preg_match('@^(?:http://)?([^/]+)@i', $string, $matches);
$host = $matches[1];
preg_match('/[^.]+\.[^.]+$/', $host, $matches);
echo "Domain: " . $matches[0] . "\n";

Well, at least it will get indexed by Google! :)

[NomikOS]

i don't sure, but there seems to be some errors:
escaping some dots . and slashes /
and matching $matches[1]

$string = $hostname; 
preg_match('@^(?:http://)?([^\/]+)@i', $string, $matches); 
$host = $matches[1];  
preg_match('/[^\.]+\.[^\.]+$/', $host, $matches);  
echo "Domain: " . $matches[1] . "\n";