diff --git a/plaso/parsers/text_plugins/iis.py b/plaso/parsers/text_plugins/iis.py
index fe6e5957f1..94c2da1800 100644
--- a/plaso/parsers/text_plugins/iis.py
+++ b/plaso/parsers/text_plugins/iis.py
@@ -95,9 +95,17 @@ class WinIISTextPlugin(interface.TextPlugin):
         lambda tokens: int(tokens[0], 10)
     )
 
+    # A scoped literal IPv6 address has a zone index suffix, such as "%3" or
+    # "%eth0", which pyparsing_common.ipv6_address does not support.
+    _ZONE_INDEX = pyparsing.Combine(
+        pyparsing.Literal("%") + pyparsing.Word(pyparsing.alphanums)
+    )
+
     _IP_ADDRESS = (
         pyparsing.pyparsing_common.ipv4_address
-        | pyparsing.pyparsing_common.ipv6_address
+        | pyparsing.Combine(
+            pyparsing.pyparsing_common.ipv6_address + pyparsing.Opt(_ZONE_INDEX)
+        )
         | _BLANK
     )
 
diff --git a/tests/parsers/text_plugins/iis.py b/tests/parsers/text_plugins/iis.py
index 8140b11b93..60bfbef9d0 100644
--- a/tests/parsers/text_plugins/iis.py
+++ b/tests/parsers/text_plugins/iis.py
@@ -11,6 +11,26 @@
 class WinIISTextPluginTest(test_lib.TextPluginTestCase):
     """Tests for the Windows IIS text parser plugin."""
 
+    # pylint: disable=protected-access
+
+    def testIPAddressWithZoneIndex(self):
+        """Tests the _IP_ADDRESS structure with a scoped IPv6 address."""
+        plugin = iis.WinIISTextPlugin()
+
+        structure = plugin._IP_ADDRESS.parse_string(
+            "fe80::1ff:fe23:4567:890a%3", parse_all=True
+        )
+        self.assertEqual(structure[0], "fe80::1ff:fe23:4567:890a%3")
+
+        structure = plugin._IP_ADDRESS.parse_string("fe80::1%eth0", parse_all=True)
+        self.assertEqual(structure[0], "fe80::1%eth0")
+
+        structure = plugin._IP_ADDRESS.parse_string("::1", parse_all=True)
+        self.assertEqual(structure[0], "::1")
+
+        structure = plugin._IP_ADDRESS.parse_string("10.10.10.100", parse_all=True)
+        self.assertEqual(structure[0], "10.10.10.100")
+
     def testProcessWithIIS6Log(self):
         """Tests the Process function with an IIS 6 log file."""
         plugin = iis.WinIISTextPlugin()