AWS Tools for Windows PowerShell
Command Reference

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Synopsis

Invokes the CreateSubnet operation against Amazon Elastic Compute Cloud.

Syntax

New-EC2Subnet
-VpcId <String>
-CidrBlock <String>
-AvailabilityZone <String>
-Ipv6CidrBlock <String>
-Force <SwitchParameter>

Description

Creates a subnet in an existing VPC. When you create each subnet, you provide the VPC ID and the IPv4 CIDR block you want for the subnet. After you create a subnet, you can't change its CIDR block. The size of the subnet's IPv4 CIDR block can be the same as a VPC's IPv4 CIDR block, or a subset of a VPC's IPv4 CIDR block. If you create more than one subnet in a VPC, the subnets' CIDR blocks must not overlap. The smallest IPv4 subnet (and VPC) you can create uses a /28 netmask (16 IPv4 addresses), and the largest uses a /16 netmask (65,536 IPv4 addresses). If you've associated an IPv6 CIDR block with your VPC, you can create a subnet with an IPv6 CIDR block that uses a /64 prefix length. AWS reserves both the first four and the last IPv4 address in each subnet's CIDR block. They're not available for use. If you add more than one subnet to a VPC, they're set up in a star topology with a logical router in the middle. If you launch an instance in a VPC using an Amazon EBS-backed AMI, the IP address doesn't change if you stop and restart the instance (unlike a similar instance launched outside a VPC, which gets a new IP address when restarted). It's therefore possible to have a subnet with no running instances (they're all stopped), but no remaining IP addresses available. For more information about subnets, see Your VPC and Subnets in the Amazon Virtual Private Cloud User Guide.

Parameters

-AvailabilityZone <String>
The Availability Zone for the subnet.Default: AWS selects one for you. If you create more than one subnet in your VPC, we may not necessarily select a different zone for each subnet.
Required?False
Position?3
Accept pipeline input?True (ByPropertyName)
-CidrBlock <String>
The IPv4 network range for the subnet, in CIDR notation. For example, 10.0.0.0/24.
Required?False
Position?2
Accept pipeline input?False
-Force <SwitchParameter>
This parameter overrides confirmation prompts to force the cmdlet to continue its operation. This parameter should always be used with caution.
Required?False
Position?Named
Accept pipeline input?False
-Ipv6CidrBlock <String>
The IPv6 network range for the subnet, in CIDR notation. The subnet size must use a /64 prefix length.
Required?False
Position?Named
Accept pipeline input?False
-VpcId <String>
The ID of the VPC.
Required?False
Position?1
Accept pipeline input?True (ByValue, ByPropertyName)

Common Credential and Region Parameters

-AccessKey <String>
The AWS access key for the user account. This can be a temporary access key if the corresponding session token is supplied to the -SessionToken parameter.
Required? False
Position? Named
Accept pipeline input? False
-Credential <AWSCredentials>
An AWSCredentials object instance containing access and secret key information, and optionally a token for session-based credentials.
Required? False
Position? Named
Accept pipeline input? False
-ProfileLocation <String>

Used to specify the name and location of the ini-format credential file (shared with the AWS CLI and other AWS SDKs)

If this optional parameter is omitted this cmdlet will search the encrypted credential file used by the AWS SDK for .NET and AWS Toolkit for Visual Studio first. If the profile is not found then the cmdlet will search in the ini-format credential file at the default location: (user's home directory)\.aws\credentials. Note that the encrypted credential file is not supported on all platforms. It will be skipped when searching for profiles on Windows Nano Server, Mac, and Linux platforms.

If this parameter is specified then this cmdlet will only search the ini-format credential file at the location given.

As the current folder can vary in a shell or during script execution it is advised that you use specify a fully qualified path instead of a relative path.

Required? False
Position? Named
Accept pipeline input? False
-ProfileName <String>
The user-defined name of an AWS credentials or SAML-based role profile containing credential information. The profile is expected to be found in the secure credential file shared with the AWS SDK for .NET and AWS Toolkit for Visual Studio. You can also specify the name of a profile stored in the .ini-format credential file used with the AWS CLI and other AWS SDKs.
Required? False
Position? Named
Accept pipeline input? False
-NetworkCredential <PSCredential>
Used with SAML-based authentication when ProfileName references a SAML role profile. Contains the network credentials to be supplied during authentication with the configured identity provider's endpoint. This parameter is not required if the user's default network identity can or should be used during authentication.
Required? False
Position? Named
Accept pipeline input? False
-SecretKey <String>
The AWS secret key for the user account. This can be a temporary secret key if the corresponding session token is supplied to the -SessionToken parameter.
Required? False
Position? Named
Accept pipeline input? False
-SessionToken <String>
The session token if the access and secret keys are temporary session-based credentials.
Required? False
Position? Named
Accept pipeline input? False
-Region <String>
The system name of the AWS region in which the operation should be invoked. For example, us-east-1, eu-west-1 etc.
Required? False
Position? Named
Accept pipeline input? False
-EndpointUrl <String>

The endpoint to make the call against.

Note: This parameter is primarily for internal AWS use and is not required/should not be specified for normal usage. The cmdlets normally determine which endpoint to call based on the region specified to the -Region parameter or set as default in the shell (via Set-DefaultAWSRegion). Only specify this parameter if you must direct the call to a specific custom endpoint.

Required? False
Position? Named
Accept pipeline input? False

Inputs

You can pipe a String object to this cmdlet for the VpcId parameter.

Outputs

This cmdlet returns a Subnet object. The service call response (type Amazon.EC2.Model.CreateSubnetResponse) can also be referenced from properties attached to the cmdlet entry in the $AWSHistory stack.

Examples

Example 1

PS C:\> New-EC2Subnet -VpcId vpc-12345678 -CidrBlock 10.0.0.0/24

AvailabilityZone : us-west-2c
AvailableIpAddressCount : 251
CidrBlock : 10.0.0.0/24
DefaultForAz : False
MapPublicIpOnLaunch : False
State : pending
SubnetId : subnet-1a2b3c4d
Tag : {}
VpcId : vpc-12345678
This example creates a subnet with the specified CIDR.

Supported Version

AWS Tools for PowerShell: 2.x.y.z