Issue #21386: Implement missing IPv4Address.is_global property

It was documented since 07a5610bae9d.

Initial patch by Roger Luethi.

Lib/ipaddress.py

@@ -1311,6 +1311,11 @@ class IPv4Address(_BaseV4, _BaseAddress):
         """
         return any(self in net for net in self._constants._private_networks)
 
+    @property
+    @functools.lru_cache()
+    def is_global(self):
+        return self not in self._constants._public_network and not self.is_private
+
     @property
     def is_multicast(self):
         """Test if the address is reserved for multicast use.
@@ -1557,6 +1562,8 @@ class _IPv4Constants:
 
     _multicast_network = IPv4Network('224.0.0.0/4')
 
+    _public_network = IPv4Network('100.64.0.0/10')
+
     _private_networks = [
         IPv4Network('0.0.0.0/8'),
         IPv4Network('10.0.0.0/8'),

Lib/test/test_ipaddress.py

@@ -1626,6 +1626,9 @@ class IpaddrUnitTest(unittest.TestCase):
         self.assertEqual(False,
                          ipaddress.ip_address('169.255.100.200').is_link_local)
 
+        self.assertTrue(ipaddress.ip_address('192.0.7.1').is_global)
+        self.assertFalse(ipaddress.ip_address('203.0.113.1').is_global)
+
         self.assertEqual(True,
                           ipaddress.ip_address('127.100.200.254').is_loopback)
         self.assertEqual(True, ipaddress.ip_address('127.42.0.0').is_loopback)

Misc/NEWS

@@ -139,6 +139,9 @@ Core and Builtins
 Library
 -------
 
+- Issue #21386: Implement missing IPv4Address.is_global property.  It was
+  documented since 07a5610bae9d.  Initial patch by Roger Luethi.
+
 - Issue #20900: distutils register command now decodes HTTP responses
   correctly.  Initial patch by ingrid.