I bought a domain from Dreamhost, but my servers are actually running on Amazon's AWS. I have an Elastic IP, say 220.127.116.11.
In the Dreamhost panel, I've added an A record for my domain name, pointing it to 18.104.22.168.
My question is, are all subdomains (e.g. www.mydomain.com, a.mydomain.com, etc.) automatically mapped to 22.214.171.124 as well, because the root is? Or do I have to add separate rules for each subdomain?