How does external DNS work with subdomains

I configured external DNS for my subdomain on site I added my CNAME records and everything worked almost instantly.

Then I tested moving that domain to another site. It just worked. I didn’t have to reconfigure my CNAME record. Why is that?

My CNAME still points to but that’s not the Netlify site it’s currently configured in. It works though.

We want to swap our domain over to a new site this week, so I need to find out if doing it this way is safe/intended

Yes, you can point to It’s valid and supported configuration and would not change.

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