Index: branches/5.1.x/core/kernel/globals.php
===================================================================
diff -u -N -r14325 -r14519
--- branches/5.1.x/core/kernel/globals.php	(.../globals.php)	(revision 14325)
+++ branches/5.1.x/core/kernel/globals.php	(.../globals.php)	(revision 14519)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: globals.php 14325 2011-05-20 08:10:28Z alex $
+* @version	$Id: globals.php 14519 2011-09-16 14:15:50Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -576,6 +576,10 @@
 		$network = trim($network);
 		$ip = trim($ip);
 
+		if ( preg_replace('/[\d\.\/-]/', '', $network) != '' ) {
+			$network = gethostbyname($network);
+		}
+
 		if ($network == $ip) {
 			// comparing two ip addresses directly
 			return true;