diff --git a/Lib/test/test_urlparse.py b/Lib/test/test_urlparse.py
index bcfc243..8c8070b 100644
--- a/Lib/test/test_urlparse.py
+++ b/Lib/test/test_urlparse.py
@@ -239,10 +239,44 @@
         #self.checkJoin(RFC2396_BASE, '?y', 'http://a/b/c/?y')
         #self.checkJoin(RFC2396_BASE, ';x', 'http://a/b/c/;x')
 
+
     def test_RFC3986(self):
         self.checkJoin(RFC3986_BASE, '?y','http://a/b/c/d;p?y')
         self.checkJoin(RFC2396_BASE, ';x', 'http://a/b/c/;x')
 
+    def test_RFC2732(self):
+        for url, hostname, port in [
+            ('http://Test.python.org:5432/foo/', 'test.python.org', 5432),
+            ('http://12.34.56.78:5432/foo/', '12.34.56.78', 5432),
+            ('http://[::1]:5432/foo/', '::1', 5432),
+            ('http://[dead:beef::1]:5432/foo/', 'dead:beef::1', 5432),
+            ('http://[dead:beef::]:5432/foo/', 'dead:beef::', 5432),
+            ('http://[dead:beef:cafe:5417:affe:8FA3:deaf:feed]:5432/foo/',
+             'dead:beef:cafe:5417:affe:8fa3:deaf:feed', 5432),
+            ('http://[::12.34.56.78]:5432/foo/', '::12.34.56.78', 5432),
+            ('http://[::ffff:12.34.56.78]:5432/foo/',
+             '::ffff:12.34.56.78', 5432),
+            ('http://Test.python.org/foo/', 'test.python.org', None),
+            ('http://12.34.56.78/foo/', '12.34.56.78', None),
+            ('http://[::1]/foo/', '::1', None),
+            ('http://[dead:beef::1]/foo/', 'dead:beef::1', None),
+            ('http://[dead:beef::]/foo/', 'dead:beef::', None),
+            ('http://[dead:beef:cafe:5417:affe:8FA3:deaf:feed]/foo/',
+             'dead:beef:cafe:5417:affe:8fa3:deaf:feed', None),
+            ('http://[::12.34.56.78]/foo/', '::12.34.56.78', None),
+            ('http://[::ffff:12.34.56.78]/foo/',
+             '::ffff:12.34.56.78', None),
+            ]:
+            urlparsed = urllib.parse.urlparse(url)
+            self.assertEqual((urlparsed.hostname, urlparsed.port) , (hostname, port))
+
+        for invalid_url in [
+                'http://::12.34.56.78]/',
+                'http://[::1/foo/',
+                'http://[::ffff:12.34.56.78']:
+            self.assertRaises(ValueError, lambda : urllib.parse.urlparse(invalid_url).hostname)
+            self.assertRaises(ValueError, lambda : urllib.parse.urlparse(invalid_url))
+
     def test_urldefrag(self):
         for url, defrag, frag in [
             ('http://python.org#frag', 'http://python.org', 'frag'),
diff --git a/Lib/urllib/parse.py b/Lib/urllib/parse.py
index 879873c..3a8fd60 100644
--- a/Lib/urllib/parse.py
+++ b/Lib/urllib/parse.py
@@ -70,22 +70,26 @@
 
     @property
     def hostname(self):
-        netloc = self.netloc
-        if "@" in netloc:
-            netloc = netloc.rsplit("@", 1)[1]
-        if ":" in netloc:
-            netloc = netloc.split(":", 1)[0]
-        return netloc.lower() or None
+        netloc = self.netloc.split('@')[-1]
+        if '[' in netloc and ']' in netloc:
+            return netloc.split(']')[0][1:].lower()
+        elif '[' in netloc or ']' in netloc:
+            raise ValueError("Invalid IPv6 hostname")
+        elif ':' in netloc:
+            return netloc.split(':')[0].lower()
+        elif netloc == '':
+            return None
+        else:
+            return netloc.lower()
 
     @property
     def port(self):
-        netloc = self.netloc
-        if "@" in netloc:
-            netloc = netloc.rsplit("@", 1)[1]
-        if ":" in netloc:
-            port = netloc.split(":", 1)[1]
+        netloc = self.netloc.split('@')[-1].split(']')[-1]
+        if ':' in netloc:
+            port = netloc.split(':')[1]
             return int(port, 10)
-        return None
+        else:
+            return None
 
 from collections import namedtuple
 
@@ -130,6 +134,10 @@
 
 def _splitnetloc(url, start=0):
     delim = len(url)   # position of end of domain part of url, default is end
+    if '[' in url:     # check for invalid IPv6 URL
+        if not ']' in url: raise ValueError("Invalid IPv6 URL")
+    elif ']' in url:
+        if not '[' in url: raise ValueError("Invalid IPv6 URL")
     for c in '/?#':    # look for delimiters; the order is NOT important
         wdelim = url.find(c, start)        # find first of this delim
         if wdelim >= 0:                    # if found