Is there any limit on number of DNS records I can add?

Let’s say I want to keep on adding new subdomains pointing to different user accounts.
demo.example.com
steve.example.com

Is there any limit on the number of DNS records I can add?
If I have 6000 users, would I be able to create 600 DNS records to redirect each user to a different part of my page?

I’m asking because I know cloudflare doesn’t allow wildcard redirections (*.example.com) and I want to know if I can proceed this way by programmatically adding new DNS records.

That question has come up a few times.

I’ve seen a limit on how many can be imported at once in a BIND file (200 at once), but not a limit on how many can exist. Still checking…

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