Yes, this should be possible with IPAM.
See below note from the documentation:
- Improves public IP addresses utilization across your organization: You can use IPAM to share IP address space across AWS accounts. Without using IPAM, you cannot share your public IP space across AWS Organizations accounts.
Currently Amazon VPC IP Address Manager supports doing this from the accounts via AWSCLI:
aws ec2 provision-public-ipv4-pool-cidr --region us-east-2 --ipam-pool-id ipam-pool-04d8e2d9670eeab21 --pool-id ipv4pool-ec2-09037ce61cf068f9a --netmask-length 27 --profile member-account
Note: I have personally not tested this, please update this thread so it can help others with similar requirements.
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