How to remove IPv4 public IP address from ec2 instances before February 2024? (IPv6)

In order to deassociate the public IPv4 address, kindly follow these steps below.

1. Create an ENI and attach it to the instance.
2. Allocate an Elastic IP address using the below doc[1]
3. Associate the Elastic IP to the primary ENI that has the public IP of the instance[2].
4. Refresh the browser page and observe the instance public IP has changed to the new Elastic IP address.
5. Disassociate the Elastic IP address from the primary ENI by following the below doc[3]
6. Refresh the browser page again, and observe the instance public IP has been removed.
7. Release the Elastic IP[4] and detach the ENI attached by the step #1.

References:

[1] Elastic IP addresses - Allocate an Elastic IP address - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html#using-instance-addressing-eips-allocating

[2] Elastic IP addresses - Associate an Elastic IP address with an instance or network interface - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html#using-instance-addressing-eips-associating

[3] Elastic IP addresses - Disassociate an Elastic IP address - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html#using-instance-addressing-eips-associating-different

[4] Elastic IP addresses - Release an Elastic IP address - https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/elastic-ip-addresses-eip.html#using-instance-addressing-eips-releasing

Cx can easily remove the same by simply disabling the Autoassign public IP option on selecting the Specific ENI under "manage IP address". Please refer below link. https://aws.amazon.com/about-aws/whats-new/2024/04/removing-adding-auto-assigned-public-ipv4-address/ Note: Enable auto-assign public IPv4 address option under Subnet settings is at Subnet level. This is different.