diff -r afe119a3619f Lib/test/test_socket.py
--- a/Lib/test/test_socket.py	Sun Jul 21 16:25:30 2013 +0200
+++ b/Lib/test/test_socket.py	Fri Jul 26 18:54:07 2013 +0100
@@ -1736,6 +1736,45 @@
     def _testRecvFromNegative(self):
         self.cli.sendto(MSG, 0, (HOST, self.port))
 
+
+@requireSocket("AF_BLUETOOTH", "SOCK_STREAM", "BTPROTO_RFCOMM")
+class BasicBluetoothTest(unittest.TestCase):
+    def setUp(self):
+        self.bs  = socket.socket(socket.AF_BLUETOOTH,
+                                 socket.SOCK_STREAM,
+                                 socket.BTPROTO_RFCOMM)
+
+    def test_address_invalid(self):
+        addr = 'ff:ff:ff:ff:fffa'
+        try:
+            self.bs.connect((addr, 1))
+        except OSError as error:
+            # bad bluetooth address
+            self.assertIsNone(error.errno)
+        else:
+            self.fail('"{addr} is not a valid address.'.format(addr=addr))
+
+    def test_address_overflow(self):
+        addr = '{0:x}:10:60:0:AA:08'.format(2 ** (8 * struct.calcsize('I')))
+        try:
+            self.bs.connect((addr, 3))
+        except OSError as error:
+            # bad bluetooth address
+            self.assertIsNone(error.errno)
+        else:
+            self.fail('"{addr}" is not a valid address.'.format(addr=addr))
+
+    def test_address_valid(self):
+        addr = 'C0:10:60:AA:36:F8'
+        try:
+            self.bs.connect((addr, 1))
+        except OSError as error:
+            # [Errno 112] Host is down.
+            self.assertEqual(error.errno, 112)
+        else:
+            self.fail('"{addr}" is a valid address.'.format(add=addr))
+
+
 # Tests for the sendmsg()/recvmsg() interface.  Where possible, the
 # same test code is used with different families and types of socket
 # (e.g. stream, datagram), and tests using recvmsg() are repeated
diff -r afe119a3619f Modules/socketmodule.c
--- a/Modules/socketmodule.c	Sun Jul 21 16:25:30 2013 +0200
+++ b/Modules/socketmodule.c	Fri Jul 26 18:54:07 2013 +0100
@@ -945,7 +945,7 @@
     char ch;
     int n;
 
-    n = sscanf(name, "%X:%X:%X:%X:%X:%X%c",
+    n = sscanf(name, "%02X:%02X:%02X:%02X:%02X:%02X%c",
                &b5, &b4, &b3, &b2, &b1, &b0, &ch);
     if (n == 6 && (b0 | b1 | b2 | b3 | b4 | b5) < 256) {
         bdaddr->b[0] = b0;