diff --git a/util/reserved-domains.json b/util/reserved-domains.json
index 65951f9307..f3890680eb 100644
--- a/util/reserved-domains.json
+++ b/util/reserved-domains.json
@@ -1,14 +1,21 @@
 [
     "api",
+    "aux",
+    "com",
+    "com[1-9]",
+    "con",
     "dns",
     "doc",
     "documentation",
     "email",
     "example",
+    "gtld",
+    "lpt[1-9]",
     "m",
     "mail",
     "maintainer",
     "maintainers",
+    "net",
     "nic",
     "noc",
     "notification",
@@ -16,7 +23,11 @@
     "notify",
     "ns",
     "ns[1-99]",
+    "nul",
     "official",
+    "org",
+    "organisation",
+    "prn",
     "redirect",
     "registry",
     "security",