BYOIP Public Address- Individual IP allocation

Question

Hello,
I read through the AWS Docs for IPAM but am a little unsure about public IP allocation. I plan on bringing a /24 CIDR and share across out organization with RAM. I understand the steps needed to create pools and share across the org. However, my question is, can I use a public pool to share my /24 across multiple accounts within a region. For example, can account-a and account-b, both in us-east-1 allocate public IP's from my /24 assigned to the us-east-1 region? accopunt-a may need 10 IP's and account-b about 5. Is something like that possible?

Thanks

Tushar_J · Accepted Answer

Hello,

Yes, this should be possible with IPAM.

See below note from the [documentation](https://docs.aws.amazon.com/vpc/latest/ipam/tutorials-byoip-ipam.html):

**********************

* 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.

Thank you

BYOIP Public Address- Individual IP allocation

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