# SetSubnets
<a name="API_SetSubnets"></a>

Enables the Availability Zones for the specified public subnets for the specified Application Load Balancer, Network Load Balancer or Gateway Load Balancer. The specified subnets replace the previously enabled subnets.

## Request Parameters
<a name="API_SetSubnets_RequestParameters"></a>

 For information about the parameters that are common to all actions, see [Common Parameters](CommonParameters.md).

 ** EnablePrefixForIpv6SourceNat **   
[Network Load Balancers with UDP listeners] Indicates whether to use an IPv6 prefix from each subnet for source NAT. The IP address type must be `dualstack`. The default value is `off`.  
Type: String  
Valid Values: `on | off`   
Required: No

 ** IpAddressType **   
The IP address type.  
[Application Load Balancers] The possible values are `ipv4` (IPv4 addresses), `dualstack` (IPv4 and IPv6 addresses), and `dualstack-without-public-ipv4` (public IPv6 addresses and private IPv4 and IPv6 addresses).  
[Network Load Balancers and Gateway Load Balancers] The possible values are `ipv4` (IPv4 addresses) and `dualstack` (IPv4 and IPv6 addresses).  
Type: String  
Valid Values: `ipv4 | dualstack | dualstack-without-public-ipv4`   
Required: No

 ** LoadBalancerArn **   
The Amazon Resource Name (ARN) of the load balancer.  
Type: String  
Required: Yes

 **SubnetMappings.member.N**   
The IDs of the public subnets. You can specify only one subnet per Availability Zone. You must specify either subnets or subnet mappings.  
[Application Load Balancers] You must specify subnets from at least two Availability Zones. You can't specify Elastic IP addresses for your subnets.  
[Application Load Balancers on Outposts] You must specify one Outpost subnet.  
[Application Load Balancers on Local Zones] You can specify subnets from one or more Local Zones.  
[Network Load Balancers] You can specify subnets from one or more Availability Zones. You can specify one Elastic IP address per subnet if you need static IP addresses for your internet-facing load balancer. For internal load balancers, you can specify one private IP address per subnet from the IPv4 range of the subnet. For internet-facing load balancer, you can specify one IPv6 address per subnet.  
[Gateway Load Balancers] You can specify subnets from one or more Availability Zones.  
Type: Array of [SubnetMapping](API_SubnetMapping.md) objects  
Required: No

 **Subnets.member.N**   
The IDs of the public subnets. You can specify only one subnet per Availability Zone. You must specify either subnets or subnet mappings.  
[Application Load Balancers] You must specify subnets from at least two Availability Zones.  
[Application Load Balancers on Outposts] You must specify one Outpost subnet.  
[Application Load Balancers on Local Zones] You can specify subnets from one or more Local Zones.  
[Network Load Balancers] You can specify subnets from one or more Availability Zones.  
[Gateway Load Balancers] You can specify subnets from one or more Availability Zones. You must include all subnets that were enabled previously, with their existing configurations, plus any additional subnets.  
Type: Array of strings  
Required: No

## Response Elements
<a name="API_SetSubnets_ResponseElements"></a>

The following elements are returned by the service.

 **AvailabilityZones.member.N**   
Information about the subnets.  
Type: Array of [AvailabilityZone](API_AvailabilityZone.md) objects

 ** EnablePrefixForIpv6SourceNat **   
[Network Load Balancers] Indicates whether to use an IPv6 prefix from each subnet for source NAT.  
Type: String  
Valid Values: `on | off` 

 ** IpAddressType **   
The IP address type.  
Type: String  
Valid Values: `ipv4 | dualstack | dualstack-without-public-ipv4` 

## Errors
<a name="API_SetSubnets_Errors"></a>

For information about the errors that are common to all actions, see [Common Error Types](CommonErrors.md).

 ** AllocationIdNotFound **   
The specified allocation ID does not exist.  
HTTP Status Code: 400

 ** AvailabilityZoneNotSupported **   
The specified Availability Zone is not supported.  
HTTP Status Code: 400

 ** CapacityReservationPending **   
There is a pending capacity reservation.  
HTTP Status Code: 400

 ** InvalidConfigurationRequest **   
The requested configuration is not valid.  
HTTP Status Code: 400

 ** InvalidSubnet **   
The specified subnet is out of available addresses.  
HTTP Status Code: 400

 ** LoadBalancerNotFound **   
The specified load balancer does not exist.  
HTTP Status Code: 400

 ** SubnetNotFound **   
The specified subnet does not exist.  
HTTP Status Code: 400

## Examples
<a name="API_SetSubnets_Examples"></a>

### Enable Availability Zones for a load balancer
<a name="API_SetSubnets_Example_1"></a>

This example enables the Availability Zone for the specified subnet for the specified load balancer.

#### Sample Request
<a name="API_SetSubnets_Example_1_Request"></a>

```
https://elasticloadbalancing.amazonaws.com/?Action=SetSubnets
&LoadBalancerArn=arn:aws:elasticloadbalancing:us-west-2:123456789012:loadbalancer/app/my-load-balancer/50dc6c495c0c9188
&Subnets.member.1=subnet-8360a9e7
&Subnets.member.2=subnet-b7d581c0
&Version=2015-12-01
&AUTHPARAMS
```

#### Sample Response
<a name="API_SetSubnets_Example_1_Response"></a>

```
<SetSubnetsResponse xmlns="http://elasticloadbalancing.amazonaws.com/doc/2015-12-01/">
  <SetSubnetsResult> 
    <AvailabilityZones> 
      <member> 
        <SubnetId>subnet-8360a9e7</SubnetId> 
        <ZoneName>us-west-2a</ZoneName> 
      </member> 
      <member> 
        <SubnetId>subnet-b7d581c0</SubnetId> 
        <ZoneName>us-west-2b</ZoneName> 
      </member> 
    </AvailabilityZones> 
  </SetSubnetsResult> 
  <ResponseMetadata> 
    <RequestId>c1a80803-f3ab-11e5-b673-8d4a8a9e6f48</RequestId> 
  </ResponseMetadata> 
</SetSubnetsResponse>
```

## See Also
<a name="API_SetSubnets_SeeAlso"></a>

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/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for .NET V4](https://docs.aws.amazon.com/goto/DotNetSDKV4/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for C\$1\$1](https://docs.aws.amazon.com/goto/SdkForCpp/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for Go v2](https://docs.aws.amazon.com/goto/SdkForGoV2/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for Java V2](https://docs.aws.amazon.com/goto/SdkForJavaV2/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for JavaScript V3](https://docs.aws.amazon.com/goto/SdkForJavaScriptV3/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for Kotlin](https://docs.aws.amazon.com/goto/SdkForKotlin/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for PHP V3](https://docs.aws.amazon.com/goto/SdkForPHPV3/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for Python](https://docs.aws.amazon.com/goto/boto3/elasticloadbalancingv2-2015-12-01/SetSubnets) 
+  [AWS SDK for Ruby V3](https://docs.aws.amazon.com/goto/SdkForRubyV3/elasticloadbalancingv2-2015-12-01/SetSubnets)