diff --git a/ns_active.js b/ns_active.js
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--- /dev/null
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+/*
+ ***** ACTIVE SUBDOMAINS (NS records)
+ * ***********************
+ *
+ * This list contains NS records in extension to the list of active CNAMEs in this repository.
+ *
+ * Second level NS records makes it possible for subdomain owners to redirect to another DNS provider.
+ * This option has potential security issues (e.g. if you use another DNS provider to add MX records to route your email traffic)
+ * and is only meant for advanced users. 
+ *
+ * You should avoid this option if you only want a JS.ORG subdomain!!!
+ * FYI: https://github.com/js-org/js.org/issues/2890
+ */
+ 
+ var ns_active = {
+  "example": ["dns1.pXX.nsone.net", "dns2.pXX.nsone.net", "dns3.pXX.nsone.net", "dns4.pXX.nsone.net"]
+ }