diff --git a/util/reserved.json b/util/reserved.json
index cf4314ff9f..d29264f7be 100644
--- a/util/reserved.json
+++ b/util/reserved.json
@@ -44,9 +44,14 @@
     "hosting",
     "http",
     "https",
+    "iad",
     "info",
     "int",
     "internal",
+    "is-a",
+    "is-a-dev",
+    "isa",
+    "isadev",
     "link",
     "login",
     "m",