aws ec2 create-subnet
Creates a subnet in a specified VPC. You must specify an IPv4 CIDR block for the subnet. After you create a subnet, you can't change its CIDR block. The allowed block size is between a /16 netmask (65,536 IP addresses) and /28 netmask (16 IP addresses). The CIDR block must not overlap with the CIDR block of an existing subnet in the VPC. 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. When you stop an instance in a subnet, it retains its private IPv4 address. 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
Options
| Name | Description |
|---|---|
--tag-specifications <list> | The tags to assign to the subnet |
--availability-zone <string> | The Availability Zone or Local Zone for the subnet. Default: AWS selects one for you. If you create more than one subnet in your VPC, we do not necessarily select a different zone for each subnet. To create a subnet in a Local Zone, set this value to the Local Zone ID, for example us-west-2-lax-1a. For information about the Regions that support Local Zones, see Available Regions in the Amazon Elastic Compute Cloud User Guide. To create a subnet in an Outpost, set this value to the Availability Zone for the Outpost and specify the Outpost ARN |
--availability-zone-id <string> | The AZ ID or the Local Zone ID of the subnet |
--ipv6-cidr-block <string> | The IPv6 network range for the subnet, in CIDR notation. The subnet size must use a /64 prefix length |
--outpost-arn <string> | The Amazon Resource Name (ARN) of the Outpost. If you specify an Outpost ARN, you must also specify the Availability Zone of the Outpost subnet |
--vpc-id <string> | The ID of the VPC |
--dry-run | 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 |
--no-dry-run | 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 |
--cidr-block <string> | The IPv4 network range for the subnet, in CIDR notation. For example, 10.0.0.0/24. We modify the specified CIDR block to its canonical form; for example, if you specify 100.68.0.18/18, we modify it to 100.68.0.0/18 |
--cli-input-json <string> | Performs service operation based on the JSON string provided. The JSON string follows the format provided by ``--generate-cli-skeleton``. If other arguments are provided on the command line, the CLI values will override the JSON-provided values. It is not possible to pass arbitrary binary values using a JSON-provided value as the string will be taken literally |
--generate-cli-skeleton <string> | Prints a JSON skeleton to standard output without sending an API request. If provided with no value or the value ``input``, prints a sample input JSON that can be used as an argument for ``--cli-input-json``. If provided with the value ``output``, it validates the command inputs and returns a sample output JSON for that command |