diff --git a/url/resources/urltestdata.json b/url/resources/urltestdata.json
index bb156f126bf9b6..1adea150918e94 100644
--- a/url/resources/urltestdata.json
+++ b/url/resources/urltestdata.json
@@ -3645,6 +3645,17 @@
     "search": "?%EF%BF%BD",
     "hash": "#%EF%BF%BD"
   },
+  "Domain is ASCII, but a label is invalid IDNA",
+  {
+    "input": "http://a.b.c.xn--pokxncvks",
+    "base": "about:blank",
+    "failure": true
+  },
+  {
+    "input": "http://10.0.0.xn--pokxncvks",
+    "base": "about:blank",
+    "failure": true
+  },
   "Test name prepping, fullwidth input should be converted to ASCII and NOT IDN-ized. This is 'Go' in fullwidth UTF-8/UTF-16.",
   {
     "input": "http://Ｇｏ.com",