--- ipaddress.py.orig	2014-04-29 13:27:07.092770307 +0200
+++ ipaddress.py	2014-04-29 13:27:11.824802543 +0200
@@ -1312,6 +1312,10 @@
                 self in IPv4Network('240.0.0.0/4') or
                 self in IPv4Network('255.255.255.255/32'))
 
+    @property
+    def is_global(self):
+        return (not self in IPv4Network('100.64.0.0/10') and
+                not self.is_private)
 
     @property
     def is_multicast(self):