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::PrefixList Entry
<a name="aws-properties-ec2-prefixlist-entry"></a>

An entry for a prefix list.

## Syntax
<a name="aws-properties-ec2-prefixlist-entry-syntax"></a>

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

### JSON
<a name="aws-properties-ec2-prefixlist-entry-syntax.json"></a>

```
{
  "[Cidr](#cfn-ec2-prefixlist-entry-cidr)" : String,
  "[Description](#cfn-ec2-prefixlist-entry-description)" : String
}
```

### YAML
<a name="aws-properties-ec2-prefixlist-entry-syntax.yaml"></a>

```
  [Cidr](#cfn-ec2-prefixlist-entry-cidr): String
  [Description](#cfn-ec2-prefixlist-entry-description): String
```

## Properties
<a name="aws-properties-ec2-prefixlist-entry-properties"></a>

`Cidr`  <a name="cfn-ec2-prefixlist-entry-cidr"></a>
The CIDR block.  
*Required*: Yes  
*Type*: String  
*Minimum*: `1`  
*Maximum*: `46`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)

`Description`  <a name="cfn-ec2-prefixlist-entry-description"></a>
A description for the entry.  
Constraints: Up to 255 characters in length.  
*Required*: No  
*Type*: String  
*Minimum*: `0`  
*Maximum*: `255`  
*Update requires*: [No interruption](https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/using-cfn-updating-stacks-update-behaviors.html#update-no-interrupt)