来自cli aws ec2 describe-instances的aws ec2实例ip地址

I would like to get all IP addresses for the ec2 instance. I am looking at the CLI aws ec2 describe-instances and I see that we have 2 places where we have IP address. I understand each interface can have own public IP/private IP and can belong to different subnets hence the fields under Network Interfaces. But what is not clear to me why we have IP address (public/private) and subnet under instance. Won't that data be part of one of the interface. Is there anything this signifies. why this duplication?``I would like to get all IP addresses for the ec