# CreateSubnetCidrReservation


Creates a subnet CIDR reservation. For more information, see [Subnet CIDR reservations](https://docs.aws.amazon.com/vpc/latest/userguide/subnet-cidr-reservation.html) in the *Amazon VPC User Guide* and [Manage prefixes for your network interfaces](https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/work-with-prefixes.html) in the *Amazon EC2 User Guide*.

## Request Parameters


The following parameters are for this specific action. For more information about required and optional parameters that are common to all actions, see [Common Query Parameters](CommonParameters.md).

 **Cidr**   
The IPv4 or IPV6 CIDR range to reserve.  
Type: String  
Required: Yes

 **Description**   
The description to assign to the subnet CIDR reservation.  
Type: String  
Required: No

 **DryRun**   
Checks whether you have the required permissions for the action, without actually making the request, and provides an error response. If you have the required permissions, the error response is `DryRunOperation`. Otherwise, it is `UnauthorizedOperation`.  
Type: Boolean  
Required: No

 **ReservationType**   
The type of reservation. The reservation type determines how the reserved IP addresses are assigned to resources.  
+  `prefix` - AWS assigns the reserved IP addresses to network interfaces.
+  `explicit` - You assign the reserved IP addresses to network interfaces.
Type: String  
Valid Values: `prefix | explicit`   
Required: Yes

 **SubnetId**   
The ID of the subnet.  
Type: String  
Required: Yes

 **TagSpecification.N**   
The tags to assign to the subnet CIDR reservation.  
Type: Array of [TagSpecification](API_TagSpecification.md) objects  
Required: No

## Response Elements


The following elements are returned by the service.

 **requestId**   
The ID of the request.  
Type: String

 **subnetCidrReservation**   
Information about the created subnet CIDR reservation.  
Type: [SubnetCidrReservation](API_SubnetCidrReservation.md) object

## Errors


For information about the errors that are common to all actions, see [Common client error codes](errors-overview.md#CommonErrors).

## See Also


For more information about using this API in one of the language-specific AWS SDKs, see the following:
+  [AWS Command Line Interface V2](https://docs.aws.amazon.com/goto/cli2/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/ec2-2016-11-15/CreateSubnetCidrReservation) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/ec2-2016-11-15/CreateSubnetCidrReservation)