在 Twitter 上看到 AWS 可以要回放掉的 Elastic IP 了。當然，這不保證會成功：
Amazon VPC now allows you to recover accidentally released EIPs. https://t.co/vWkBamNLYD pic.twitter.com/Bhk9339CT2
— Amazon Web Services (@awscloud) August 21, 2017
文件在「Recovering an Elastic IP Address」這邊，目前只支援 API 以及對應的 command line 工具：
Currently, you can recover an Elastic IP address using the Amazon EC2 API or a command line tool only.
指令像這樣：
aws ec2 allocate-address --domain vpc --address 203.0.113.3