We have an app that runs in a single instance but uses subdomains to identify branding of the site, eg.
other.domain.com both points to the same app, but we parse it and decide what to show with client code.
I’ve seen the topic Wildcard subdomains & redirects, but I am hoping it’s something different. The price tag of the Pro plan is too high for our little startup yet.
We have successfully setup Netlify DNS for our custom domain.