Add More IP Addresses to a Subnet
If subnets in your VPC run out of available IP addresses, AWS resources, such as load balancers, might not respond successfully to increased traffic.
It's a best practice to keep at least eight IP addresses in each subnet available for use. There are two ways to free up or add additional IP addresses for use with load balancers. The following considerations apply to both Application Load Balancers and Classic Load Balancers:
- Delete unused elastic network interfaces (ENIs) to free up IP addresses in the subnet.
- Create and add a new subnet to your VPC.
Note: Keep the requirements for subnets on a load balancer in mind—specifically, that load balancers can have at most one subnet per Availability Zone.
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