Is there a way that I can make a specific subdomain point to our 404 page?
If the sub-domain hostname is added to Cloudflare, therefore set to proxied , using a Page Rule, each request to
sub.mydomain.com, can be redirected (301 Forwarding) to the path of your custom URL (which contains a 404 page like
Another way could be using Cloudflare Workers to respond as a custom HTML page looking like “404 error” (but this could cost you up if a lot of daily requests would end up here and being served by using it).
Otherwise, you might want to setup error 404 page for your sub-domain at the origin host/server.
You can also setup a Firewall Rule to allow only your own IP address to your sub-domain and block each other request to it, or like block every request made which contains hostname like
sub.yourdomain.com to your sub-domain in case of a security measurement if needed.
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