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Used for groups that launch instances into a virtual private cloud (VPC). Specifies whether to assign a public IP address to each instance. For more information, see Launching Auto Scaling Instances in a VPC ( in the Auto Scaling User Guide.

If you specify this parameter, be sure to specify at least one subnet when you create your group.

Default: If the instance is launched into a default subnet, the default is true. If the instance is launched into a nondefault subnet, the default is false. For more information, see Supported Platforms ( in the Amazon Elastic Compute Cloud User Guide.