diff -r 1733b3bd46db Lib/ipaddress.py
--- a/Lib/ipaddress.py	Fri Oct 16 22:47:29 2015 -0700
+++ b/Lib/ipaddress.py	Sat Oct 17 14:56:25 2015 +0300
@@ -677,8 +677,7 @@
         # dealing with another address
         else:
             # address
-            return (int(self.network_address) <= int(other._ip) <=
-                    int(self.broadcast_address))
+            return other._ip & self.netmask._ip == self.network_address._ip
 
     def overlaps(self, other):
         """Tell if self is partly contained in other."""