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That suggested, it could be done with ports, or it could be done with separate servers.
Domain.com resolves to 1.2.3.4
www.domain.com resolves to 1.2.3.4:443
app.domain.com resolves to 1.2.3.4:5555
Games.domain.com resolves to 1.2.5.6
Mail.domaim.com resolves to 1.2.7.8
Portal.domain.com resolves to 1.2.9.10
Etc, etc.
This is how I set up my reverse proxy and it works really well with wildcard SSL certs. Only need one certificate for as many sites as I want!
Or you can use something like caddy that will set up certs automatically using tls-alpn-01 challenge, so no need for dns challenge .
I haven't tried caddy but I've heard good things. I've used nginx in the past. I'm currently using Traefik and have been for a few years now. Once it's set up its pretty great.