diff --git a/test.py b/test.py
index d617363..b0cc126 100644
--- a/test.py
+++ b/test.py
@@ -188,6 +188,12 @@ def test_ipv6_9(self):
         self.assertTrue(net.subnet() == 115)
         self.assertTrue(net.version() == 6)
 
+    def test_ipv6_10(self):
+        net = Network('0::1.2.3.4', 99)
+        self.assertTrue(str(net) == '0000:0000:0000:0000:0000:0000:0102:0304/99')
+        self.assertTrue(net.subnet() == 115)
+        self.assertTrue(net.version() == 6)
+
 
 class TestIP(unittest.TestCase):