Is there any way to track EIP allocation and releases?

Any time an Elastic IP is allocated, associated, or disassociated there is a CloudTrail log created. The event names are:

• AllocateAddress
• AssociateAddress
• DisassociateAddress

You can search these event names in CloudTrail and that will show you information such as the username of the person associated with the change, the time, account, etc. Once you have that information you can set up alerting to send an email, text message, or even Slack notifications whenever an EIP is allocated/associated/disassociated. Here's a quick tutorial on using EventBridge to do just that.

If you're looking for an ongoing way to track historical IP Address history Amazon VPC IP Address Manager (IPAM) was just released in December of 2021 and allows you to do just that (as well as simplify IP address management on AWS). After setting up IPAM, you can follow these instructions to search for historical data on:

• VPCs
• VPC Subnets
• Elastic IP addresses
• EC2 instances
• EC2 network interfaces attached to instances

Hi - [Amazon VPC IP Address Manager (IPAM)] (https://aws.amazon.com/blogs/aws/network-address-management-and-auditing-at-scale-with-amazon-vpc-ip-address-manager/) helps you to automate IP assignment, monitor and audit your IP address space including BYOIP, EIPs and VPC IPs.

IPAM is integrated with CloudWatch as well as provide [historical insights] (https://d2908q01vomqb2.cloudfront.net/da4b9237bacccdf19c0760cab7aec4a8359010b0/2021/11/26/ipam_historical_insights.png) which could solve your ask. Please refer to the pricing listed here.

CloudTrail/EventBridge solution as suggested by Joe will be a good approach as well.