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When you launch an instance, we allocate a primary private IPv4 address for the instance.

Each instance is also given an internal DNS hostname that resolves to the primary private IPv4 address; for example, .

As a result, new instances might not receive traffic while terminated instances continue to receive requests. You can allocate your own Elastic IP address, and associate it with your instance. If your instance is in a VPC and you assign it an Elastic IP address, it receives an IPv4 DNS hostname if DNS hostnames are enabled.

For more information, see Using DNS with Your VPC in the An Elastic IP address is a public IPv4 address that you can allocate to your account.

We resolve an external DNS hostname to the public IP address of the instance outside the network of the instance, and to the private IPv4 address of the instance from within the network of the instance.