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Hi, for each AZ you configured the ALB will provision an Elastic Network Interface (ENI) in the corresponding subnet you've selected, and it will assign a private IP as well as a public IP address for the ENI.
You could find all the ALB ENI and its public/private IP information at "EC2" > "Network & Security" > "Network Interfaces". However please note that for the ALB to provision an ENI in a particular AZ, you need at least one instance (belongs to that AZ) configured in the ALB target group. I suspect you didn't have an instance in the 3rd AZ or was not configured in the target group, and so ALB didn't provision an ENI in that AZ and hence you are not getting the 3rd IP in the DNS response.
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