outline
Amazon started to charge Public IPv4 addresses on Feb.1 2024. From now on, You need to check Public IP usage status. And, you need to consider using IPv6 which is free for charge not using IPv4.
how-to-check-ip-usage-status
AWS Web Console >> VPC >> Down side of Left Menu >> Amazon VPC IP Address Manager
AWS Web Console >> VPC >> Down side of Left Menu >> Amazon VPC IP Address Manager >> Public IP insights
AWS Web Console >>Billing and Cost Management >> Bills >> Charges by service >> VPC >> Region >> Amazon Virtual Private Cloud Public IPv4 Addresses or Amazon Virtual Private Cloud VpcEndpoint ($0.005 per IP per hour)
reference
https://docs.aws.amazon.com/vpc/latest/ipam/view-public-ip-insights.html
https://docs.aws.amazon.com/vpc/latest/ipam/view-history-cidr-ipam.html?icmpid=docs_ipam_console
https://docs.aws.amazon.com/vpc/latest/userguide/vpc-migrate-ipv6.html