I bought a domain from Dreamhost, but my servers are actually running on Amazon's AWS. I have an Elastic IP, say 18.104.22.168.
In the Dreamhost panel, I've added an A record for my domain name, pointing it to 22.214.171.124.
My question is, are all subdomains (e.g. www.mydomain.com, a.mydomain.com, etc.) automatically mapped to 126.96.36.199 as well, because the root is? Or do I have to add separate rules for each subdomain?