diff --git a/domains/undefined.json b/domains/undefined.json
new file mode 100644
index 000000000..fcf0dfc26
--- /dev/null
+++ b/domains/undefined.json
@@ -0,0 +1,12 @@
+{
+    "description": "This subdomain is for my personal portfolio website.",
+    "repo": "https://github.com/baokhang4930/baokhang4930.github.io",
+    "owner": {
+        "username": "baokhang4930",
+        "email": "baokhang4930@gmail.com",
+        "twitter": "undefiined__"
+    },
+    "record": {
+        "CNAME": "baokhang4930.github.io"
+    }
+}