Host’s name on comments

$comment_author_domain = gethostbyaddr($comment->comment_author_IP);

Thks! ??

I’ve created 2 functions (get and echo) on comment-functions.php:

********
function get_host_domain() {
global $comment;
$comment_author_domain = gethostbyaddr($comment->comment_author_IP);
return apply_filters(‘get_host_domain’, $comment->comment_author_IP);
}
function host_domain() {
echo get_host_domain();
}
*************
but instead of the host name (IP host name, as it appears on the comment email notification

Author : Krip (IP: 212.113.164.105 , ce01pc09.netcabo.net)

I got only the IP number as result. Anything wrong with code?

There is no filter get_host_domain, so that should be a no-op. For diagnostic purposes, though, remove that line. Then compare the output between
get_host_domain();
and
echo host_domain();

Do they both spit out an IP?

Are you calling this from within the comments loop?

I’ve removed the filter

return apply_filters(‘get_host_domain’, $comment->comment_author_IP);

Now, neither the

get_host_domain(); nor echo host_domain();

show any results (no IP number too). Funny, because the function with the filter showed the IP nr., but not the IP host name.
******
Yes, I’m calling this from within the comments loop:

<h4><?php comment_type(__(‘Comment’), __(‘Trackback’), __(‘Pingback’)); ?> <?php _e(‘by’); ?> <?php comment_author_link() ?> // IP <?php host_domain(); ?></h4>