This is the new *CloudFormation Template Reference Guide*. Please update your bookmarks and links. For help getting started with CloudFormation, see the [AWS CloudFormation User Guide](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/Welcome.html).
# AWS::EC2::IPAMPoolCidr

A CIDR provisioned to an IPAM pool.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "Type" : "AWS::EC2::IPAMPoolCidr",
 "Properties" : {
 "[Cidr](#cfn-ec2-ipampoolcidr-cidr)" : {{String}},
 "[IpamPoolId](#cfn-ec2-ipampoolcidr-ipampoolid)" : {{String}},
 "[NetmaskLength](#cfn-ec2-ipampoolcidr-netmasklength)" : {{Integer}}
 }
}
```
### YAML

```
Type: AWS::EC2::IPAMPoolCidr
Properties:
 [Cidr](#cfn-ec2-ipampoolcidr-cidr): {{String}}
 [IpamPoolId](#cfn-ec2-ipampoolcidr-ipampoolid): {{String}}
 [NetmaskLength](#cfn-ec2-ipampoolcidr-netmasklength): {{Integer}}
```
## Properties

`Cidr` 
The CIDR provisioned to the IPAM pool. A CIDR is a representation of an IP address and its associated network mask (or netmask) and refers to a range of IP addresses. An IPv4 CIDR example is `10.24.34.0/23`. An IPv6 CIDR example is `2001:DB8::/32`. 
*Required*: No 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`IpamPoolId` 
The ID of the IPAM pool. 
*Required*: Yes 
*Type*: String 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
`NetmaskLength` 
The netmask length of the CIDR you'd like to provision to a pool. Can be used for provisioning Amazon-provided IPv6 CIDRs to top-level pools and for provisioning CIDRs to pools with source pools. Cannot be used to provision BYOIP CIDRs to top-level pools. "NetmaskLength" or "Cidr" is required. 
*Required*: No 
*Type*: Integer 
*Update requires*: [Replacement](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-replacement)
## Return values

### Ref

When you pass the logical ID of this resource to the intrinsic `Ref` function, `Ref` returns the IPAM pool ID and IPAM pool CIDR ID in the following format: `ipam-pool-01123456|ipam-pool-cidr-0123456`.
### Fn::GetAtt

The `Fn::GetAtt` intrinsic function returns a value for a specified attribute of this type. The following are the available attributes and sample return values.
For more information about using the `Fn::GetAtt` intrinsic function, see [https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html](https://docs.aws.amazon.com/AWSCloudFormation/latest/TemplateReference/intrinsic-function-reference-getatt.html).
#### 

`IpamPoolCidrId` 
The IPAM pool CIDR ID.
`State` 
The state of the CIDR.</div><div class="naked_ctrl">
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