Amazon VPC IP Address Manager (IPAM) now supports three new CloudWatch metrics — VpcIPUsage, SubnetIPUsage, and PublicIPv4PoolIPUsage, that allow you to identify underutilized or near full capacity IP address ranges, optimizing your IP address usage on AWS. These metrics proactively track IP address usage across resources such as Amazon Virtual Private Clouds (Amazon VPCs), subnets, and Public IPv4 Pools. You can also set alarms for these metrics in Amazon CloudWatch to receive notifications when an IP address usage threshold is breached. Moreover, for a consolidated view of all IP address-related insights, these metrics are available on the IPAM Dashboard.
Source:: Amazon AWS