Index: django/core/validators.py
===================================================================
--- django/core/validators.py	(revision 12617)
+++ django/core/validators.py	(working copy)
@@ -58,23 +58,18 @@
         except ValidationError, e:
             # Trivial case failed. Try for possible IDN domain
             if value:
-                original = value
                 value = smart_unicode(value)
-                splitted = urlparse.urlsplit(value)
+                scheme, netloc, path, query, fragment = urlparse.urlsplit(value)
                 try:
-                    netloc_ace = splitted[1].encode('idna') # IDN -> ACE
+                    netloc = netloc.encode('idna') # IDN -> ACE
                 except UnicodeError: # invalid domain part
                     raise e
-                value = value.replace(splitted[1], netloc_ace)
-                # If no URL path given, assume /
-                if not splitted[2]:
-                    value += u'/'
-                super(URLValidator, self).__call__(value)
-                # After validation revert ACE encoded domain-part to
-                # original (IDN) value as suggested by RFC 3490
-                value = original
+                url = urlparse.urlunsplit((scheme, netloc, path, query, fragment))
+                super(URLValidator, self).__call__(url)
             else:
                 raise
+        else:
+            url = value
 
         if self.verify_exists:
             import urllib2
@@ -86,7 +81,7 @@
                 "User-Agent": self.user_agent,
             }
             try:
-                req = urllib2.Request(value, None, headers)
+                req = urllib2.Request(url, None, headers)
                 u = urllib2.urlopen(req)
             except ValueError:
                 raise ValidationError(_(u'Enter a valid URL.'), code='invalid')
Index: tests/regressiontests/forms/fields.py
===================================================================
--- tests/regressiontests/forms/fields.py	(revision 12617)
+++ tests/regressiontests/forms/fields.py	(working copy)
@@ -531,6 +531,13 @@
             f.clean('http://google.com/we-love-microsoft.html') # good domain, bad page
         except ValidationError, e:
             self.assertEqual("[u'This URL appears to be a broken link.']", str(e))
+        # Valid and existent IDN
+        self.assertEqual(u'http://\u05e2\u05d1\u05e8\u05d9\u05ea.idn.icann.org/', f.clean(u'http://עברית.idn.icann.org/'))
+        # Valid but non-existent IDN
+        try:
+            f.clean(u'http://broken.עברית.idn.icann.org/')
+        except ValidationError, e:
+            self.assertEqual("[u'This URL appears to be a broken link.']", str(e))
 
     def test_urlfield_40(self):
         f = URLField(verify_exists=True, required=False)