diff -r 404dcd29b0a6 Lib/ipaddress.py
--- a/Lib/ipaddress.py  Sun Jun 22 19:47:22 2014 -0700
+++ b/Lib/ipaddress.py  Mon Jun 23 14:24:09 2014 +0200
@@ -691,7 +691,8 @@
             return False
         # dealing with another network.
         if isinstance(other, _BaseNetwork):
-            return False
+            return (int(self.network_address) <= int(other.network_address) and
+                    int(self.broadcast_address) >= int(other.broadcast_address))
         # dealing with another address
         else:
             # address
diff -r 404dcd29b0a6 Lib/test/test_ipaddress.py
--- a/Lib/test/test_ipaddress.py  Sun Jun 22 19:47:22 2014 -0700
+++ b/Lib/test/test_ipaddress.py  Mon Jun 23 14:24:09 2014 +0200
@@ -556,13 +556,13 @@
                 self.assertNotEqual(lhs, rhs)

     def test_containment(self):
-        for obj in self.v4_addresses:
+        for obj in self.v4_addresses + [self.v4net]:
             self.assertIn(obj, self.v4net)
-        for obj in self.v6_addresses:
+        for obj in self.v6_addresses + [self.v6net]:
             self.assertIn(obj, self.v6net)
-        for obj in self.v4_objects + [self.v6net]:
+        for obj in self.v4_objects:
             self.assertNotIn(obj, self.v6net)
-        for obj in self.v6_objects + [self.v4net]:
+        for obj in self.v6_objects:
             self.assertNotIn(obj, self.v4net)

     def test_mixed_type_ordering(self):