This can be ok, it depends on what that company is doing with its nameservers. But in any case, its just about the name servers as intodns is a diagnostics tool and not about your domain. So as long as you are not the owner of the company domainsaubillig, then it does not matter for you.
Ah ok, great So this can be marked as solved then. I've learned a lot and everythings working now. Thank you very much for your patience!
