Invalid URL , subdomain takeover?

Hi !
I’m new to bug bounty and I found some subdomain of a website pointing to some url “Invalid URL” reponse.
like :

Invalid URL
The requested URL “[no URL]”, is invalid.
Reference #9.8770dd58.1533901848.1672fb49

I would like to know if theses responses are potential subdomain takeover or not ?
Thank you.

Hi @Neolex,

very difficult to tell without context.
I’ve seen that message but I don’t remember if I got something from it.
A useful resource to see if you have a subdomain takeover vulnerability is here: