CloudFormation Tempate - Choose Other private IP addresses

Hello

You can use the Example below, ip – Targets are registered as IP addresses. You can use any IPv4 address from the load balancer’s VPC CIDR for targets within load balancer’s VPC and any IPv4 address from the RFC 1918 ranges (10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16) or the RFC 6598 range (100.64.0.0/10) for targets located outside the load balancer’s VPC (this includes Peered VPC, EC2-Classic, and on-premises targets reachable over Direct Connect or VPN).

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AWSTemplateFormatVersion: '2010-09-09'
Description: 'Target Group for the Load balancer'

# target group Load balancer
Resources:

  NetworkLoadBalancerTargetGroup:
    Type: AWS::ElasticLoadBalancingV2::TargetGroup
    Properties:
      Name: "NlbTargetGroup"
      Port: 80
      Protocol: HTTP
      VpcId: "vpc-XXXXXX"
      TargetGroupAttributes:
        - Key: deregistration_delay.timeout_seconds
          Value: 300
      TargetType: ip
      Targets: # list of the primary IP addresses of the Network interface(s) associated with the VPC endpoint
         - Id: 172.31.0.XX
           Port: 80
         - Id: 172.31.0.XX
           Port: 80