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McEphin

McEphin

D

http://www.aiotestking.com/amazon/which-dns-name-can-only-be-resolved-within-amazon-ec2/

http://docs.aws.amazon.com/AmazonVPC/latest/UserGuide/vpc-dns.html
A private (internal) DNS hostname resolves to the private IPv4 address of the instance

To view DNS hostnames for an instance using the console
1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
2. In the navigation pane, choose Instances.
3. Select your instance from the list.
4. In the details pane, the Public DNS (IPv4) and Private DNS fields display the DNS hostnames, if applicable.

In the AWS documentation (Internal) is used in brackets which indicates that it is for clarification purposes, you can also see that in the console the address is under Private DNS