diff --git a/Doc/library/ipaddress.rst b/Doc/library/ipaddress.rst
index 7336204..af1b3b8 100644
--- a/Doc/library/ipaddress.rst
+++ b/Doc/library/ipaddress.rst
@@ -160,7 +160,7 @@
 
    .. attribute:: is_global
 
-      ``True`` if the address is allocated for private networks.  See
+      ``True`` if the address is allocated for public networks.  See
       iana-ipv4-special-registry (for IPv4) or iana-ipv6-special-registry
       (for IPv6).
 
diff --git a/Lib/ipaddress.py b/Lib/ipaddress.py
index 53423e2..7936192 100644
--- a/Lib/ipaddress.py
+++ b/Lib/ipaddress.py
@@ -984,7 +984,7 @@
 
     @property
     def is_global(self):
-        """Test if this address is allocated for private networks.
+        """Test if this address is allocated for public networks.
 
         Returns:
             A boolean, True if the address is not reserved per
@@ -1233,6 +1233,7 @@
         return self in reserved_network
 
     @property
+    @functools.lru_cache()
     def is_private(self):
         """Test if this address is allocated for private networks.
 
@@ -1259,14 +1260,14 @@
 
     @property
     def is_global(self):
-        """Test if this address is allocated for private networks.
+        """Test if this address is allocated for public networks.
 
         Returns:
             A boolean, True if the address is not reserved per
             iana-ipv4-special-registry.
 
         """
-        return not self.is_private
+        return self in IPv4Network('100.64.0.0/10') or not self.is_private
 
 
     @property
@@ -1856,6 +1857,7 @@
         return self in sitelocal_network
 
     @property
+    @functools.lru_cache()
     def is_private(self):
         """Test if this address is allocated for private networks.
 
diff --git a/Lib/test/test_ipaddress.py b/Lib/test/test_ipaddress.py
index c2a2009..25f190c 100644
--- a/Lib/test/test_ipaddress.py
+++ b/Lib/test/test_ipaddress.py
@@ -1320,6 +1320,7 @@
                 '127.42.0.0/16').is_loopback)
         self.assertEqual(False, ipaddress.ip_network('128.0.0.0').is_loopback)
         self.assertEqual(True, ipaddress.ip_network('100.64.0.0/10').is_private)
+        self.assertEqual(False, ipaddress.ip_network('100.64.0.0/10').is_global)
         self.assertEqual(True,
                          ipaddress.ip_network('192.0.2.128/25').is_private)
         self.assertEqual(True,