diff --git a/util/disallowed-cnames.json b/util/disallowed-cnames.json
index 70ee86789e..3b4380aaf2 100644
--- a/util/disallowed-cnames.json
+++ b/util/disallowed-cnames.json
@@ -13,5 +13,6 @@
     ".trycloudflare.com",
     ".tk",
     ".workers.dev",
-    ".xxx"
+    ".xxx",
+    ".ts.net"
 ]