diff -r 77e051525523 Lib/test/test_urlparse.py
--- a/Lib/test/test_urlparse.py	Mon Mar 14 00:39:33 2011 -0700
+++ b/Lib/test/test_urlparse.py	Mon Mar 14 01:19:24 2011 -0700
@@ -196,10 +196,13 @@
         #self.checkJoin(RFC1808_BASE, 'http:g', 'http:g')
         #self.checkJoin(RFC1808_BASE, 'http:', 'http:')
 
+    def test_RFC2368(self):
+        # Issue 11467: path that starts with a number is not parsed correctly
+        self.assertEqual(urlparse.urlparse('mailto:1337@example.org'),
+                ('mailto', '', '1337@example.org', '', '', ''))
+
     def test_RFC2396(self):
         # cases from RFC 2396
-
-
         self.checkJoin(RFC2396_BASE, 'g:h', 'g:h')
         self.checkJoin(RFC2396_BASE, 'g', 'http://a/b/c/g')
         self.checkJoin(RFC2396_BASE, './g', 'http://a/b/c/g')
diff -r 77e051525523 Lib/urlparse.py
--- a/Lib/urlparse.py	Mon Mar 14 00:39:33 2011 -0700
+++ b/Lib/urlparse.py	Mon Mar 14 01:19:24 2011 -0700
@@ -187,11 +187,15 @@
             v = SplitResult(scheme, netloc, url, query, fragment)
             _parse_cache[key] = v
             return v
-        if url.endswith(':') or not url[i+1].isdigit():
-            for c in url[:i]:
-                if c not in scheme_chars:
-                    break
-            else:
+        for c in url[:i]:
+            if c not in scheme_chars:
+                break
+        else:
+            try:
+                # make sure "url" is not actually a port number (in which case
+                # "scheme" is really part of the path
+                _ = int(url[i+1:])
+            except ValueError:
                 scheme, url = url[:i].lower(), url[i+1:]
 
     if url[:2] == '//':