diff --git a/lib/yform/validate/type.php b/lib/yform/validate/type.php
index 7f700d79..eadb107d 100644
--- a/lib/yform/validate/type.php
+++ b/lib/yform/validate/type.php
@@ -83,6 +83,55 @@ public function enterObject()
                 if (preg_match($xsRegEx_hex, $Object->getValue()) == 0) {
                     $w = true;
                 }
+                break;
+            case 'iban':
+                $iban = strtolower($Object->getValue());
+
+                $countries = [
+                    'al'=>28,'ad'=>24,'at'=>20,'az'=>28,'bh'=>22,'be'=>16,'ba'=>20,'br'=>29,'bg'=>22,'cr'=>21,'hr'=>21,'cy'=>28,'cz'=>24,
+                    'dk'=>18,'do'=>28,'ee'=>20,'fo'=>18,'fi'=>18,'fr'=>27,'ge'=>22,'de'=>22,'gi'=>23,'gr'=>27,'gl'=>18,'gt'=>28,'hu'=>28,
+                    'is'=>26,'ie'=>22,'il'=>23,'it'=>27,'jo'=>30,'kz'=>20,'kw'=>30,'lv'=>21,'lb'=>28,'li'=>21,'lt'=>20,'lu'=>20,'mk'=>19,
+                    'mt'=>31,'mr'=>27,'mu'=>30,'mc'=>27,'md'=>24,'me'=>22,'nl'=>18,'no'=>15,'pk'=>24,'ps'=>29,'pl'=>28,'pt'=>25,'qa'=>29,
+                    'ro'=>24,'sm'=>27,'sa'=>24,'rs'=>22,'sk'=>24,'si'=>19,'es'=>24,'se'=>24,'ch'=>21,'tn'=>24,'tr'=>26,'ae'=>23,'gb'=>22,'vg'=>24
+                ];
+                $chars = [
+                    'a'=>10,'b'=>11,'c'=>12,'d'=>13,'e'=>14,'f'=>15,'g'=>16,'h'=>17,'i'=>18,'j'=>19,'k'=>20,'l'=>21,'m'=>22,
+                    'n'=>23,'o'=>24,'p'=>25,'q'=>26,'r'=>27,'s'=>28,'t'=>29,'u'=>30,'v'=>31,'w'=>32,'x'=>33,'y'=>34,'z'=>35
+                ];
+
+                if (!isset($countries[substr($iban,0,2)]) || strlen($iban) != $countries[substr($iban,0,2)]) {
+                    $w = true;
+                } else {
+                    $movedChar = substr($iban, 4).substr($iban,0,4);
+                    $movedCharArray = str_split($movedChar);
+                    $newString = '';
+
+                    foreach ($movedCharArray as $k => $v) {
+                        if (!is_numeric($movedCharArray[$k])) {
+                            $movedCharArray[$k] = $chars[$movedCharArray[$k]];
+                        }
+                        $newString .= $movedCharArray[$k];
+                    }
+
+                    if (function_exists('bcmod')) {
+                        $w = bcmod($newString, '97') == 1;
+                    } else {
+                        $x = $newString;
+                        $y = '97';
+                        $take = 5;
+                        $mod = '';
+
+                        do {
+                            $a = (int)$mod.substr($x, 0, $take);
+                            $x = substr($x, $take);
+                            $mod = $a % $y;
+                        }
+                        while (strlen($x));
+
+                        $w = (int)$mod == 1;
+                    }
+                }
+
                 break;
             case 'json':
                 json_decode($Object->getValue());
@@ -106,7 +155,7 @@ public function enterObject()
 
     public function getDescription()
     {
-        return 'validate|type|name|int/float/numeric/string/email/url/date/datetime/hex/json|warning_message|[1=field not empty]';
+        return 'validate|type|name|int/float/numeric/string/email/url/date/datetime/hex/iban/json|warning_message|[1=field not empty]';
     }
 
     public function getDefinitions()
@@ -116,7 +165,7 @@ public function getDefinitions()
             'name' => 'type',
             'values' => [
                 'name' => ['type' => 'select_name', 'label' => rex_i18n::msg('yform_validate_type_name')],
-                'type' => ['type' => 'choice',    'label' => rex_i18n::msg('yform_validate_type_type'), 'choices' => 'int,float,numeric,string,email,url,time,date,datetime,hex,json'],
+                'type' => ['type' => 'choice',    'label' => rex_i18n::msg('yform_validate_type_type'), 'choices' => 'int,float,numeric,string,email,url,time,date,datetime,hex,iban,json'],
                 'message' => ['type' => 'text',    'label' => rex_i18n::msg('yform_validate_type_message')],
                 'not_required' => ['type' => 'boolean',    'label' => rex_i18n::msg('yform_validate_type_not_required'), 'default' => 0],
             ],