I am hosting a webserver with about 200 domains. The DNS records of those domains are a simple CNAME record of the form:
*.domain1.com. CNAME myhostingserver.mydomain.com.
*.domain2.com. CNAME myhostingserver.mydomain.com.
And so on...
In my domain, I have a simple A record of the form
myhostingserver.mydomain.com. A 1.2.3.4
This way, when I move myhostingserver to another IP, I have to change only the A record of myhostingserver in the mydomain.com zone.
This configuration works great, except for Internet Explorer / Edge that does not recognice the address http://domain1.com (without a subdomain). Other explorers like chrome and firefox or safary magicaly recognizes it perfectly.
In AWS route53 (And some other DNS managers) it does not allow a "subdomain empty" CNAME record of the form
domain1.com. CNAME myhostingserver.mydomain.com.
Is there any trick to force that? Is there any other strategy that prevents changing 200 A records of different zones just to change a server IP?
