How to map only subdomain to App Engine without the naked domain?

Question

My use case is this: I have a domain that points to a server at IP 1.2.3.4 and I would like a subdomain at the domain to point to my App Engine application i.e.

example.com --> 1.2.3.4

app.example.com --> App Engine application

The naked domain as well as the www subdomain must point to the standalone server.

From what I've found out so far, this doesn't seem possible.

Would anyone be able to confirm if this configuration is indeed not possible?

Answer 1

I might actually have a better solution to this. You can only verify the subdomain.domain.tld with google. Then you only will add A and AAAA entries to the DNS, with the alias subdomain.

subdomaid.domain.tld will then be independent from domain.tld