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

An entry for a prefix list.
## Syntax

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

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

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

`Cidr` 
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 description for the entry. 
Constraints: Up to 255 characters in length. 
*Required*: No 
*Type*: String 
*Minimum*: `0` 
*Maximum*: `255` 
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