AWS CLI Command Reference

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[ aws . ec2 ]

create-default-subnet

Description

Creates a default subnet with a size /20 IPv4 CIDR block in the specified Availability Zone in your default VPC. You can have only one default subnet per Availability Zone. For more information, see Create a default subnet in the Amazon VPC User Guide .

See also: AWS API Documentation

Synopsis

  create-default-subnet
--availability-zone <value>
[--dry-run | --no-dry-run]
[--ipv6-native | --no-ipv6-native]
[--cli-input-json <value>]
[--generate-cli-skeleton <value>]
[--debug]
[--endpoint-url <value>]
[--no-verify-ssl]
[--no-paginate]
[--output <value>]
[--query <value>]
[--profile <value>]
[--region <value>]
[--version <value>]
[--color <value>]
[--no-sign-request]
[--ca-bundle <value>]
[--cli-read-timeout <value>]
[--cli-connect-timeout <value>]

Options

--availability-zone (string)

The Availability Zone in which to create the default subnet.

--dry-run | --no-dry-run (boolean)

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 .

--ipv6-native | --no-ipv6-native (boolean)

Indicates whether to create an IPv6 only subnet. If you already have a default subnet for this Availability Zone, you must delete it before you can create an IPv6 only subnet.

--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.

Global Options

--debug (boolean)

Turn on debug logging.

--endpoint-url (string)

Override command's default URL with the given URL.

--no-verify-ssl (boolean)

By default, the AWS CLI uses SSL when communicating with AWS services. For each SSL connection, the AWS CLI will verify SSL certificates. This option overrides the default behavior of verifying SSL certificates.

--no-paginate (boolean)

Disable automatic pagination. If automatic pagination is disabled, the AWS CLI will only make one call, for the first page of results.

--output (string)

The formatting style for command output.

  • json
  • text
  • table

--query (string)

A JMESPath query to use in filtering the response data.

--profile (string)

Use a specific profile from your credential file.

--region (string)

The region to use. Overrides config/env settings.

--version (string)

Display the version of this tool.

--color (string)

Turn on/off color output.

  • on
  • off
  • auto

--no-sign-request (boolean)

Do not sign requests. Credentials will not be loaded if this argument is provided.

--ca-bundle (string)

The CA certificate bundle to use when verifying SSL certificates. Overrides config/env settings.

--cli-read-timeout (int)

The maximum socket read time in seconds. If the value is set to 0, the socket read will be blocking and not timeout. The default value is 60 seconds.

--cli-connect-timeout (int)

The maximum socket connect time in seconds. If the value is set to 0, the socket connect will be blocking and not timeout. The default value is 60 seconds.

Examples

Note

To use the following examples, you must have the AWS CLI installed and configured. See the Getting started guide in the AWS CLI User Guide for more information.

Unless otherwise stated, all examples have unix-like quotation rules. These examples will need to be adapted to your terminal's quoting rules. See Using quotation marks with strings in the AWS CLI User Guide .

To create a default subnet

This example creates a default subnet in Availability Zone us-east-2a.

Command:

 aws ec2 create-default-subnet --availability-zone us-east-2a

{
   "Subnet": {
       "AvailabilityZone": "us-east-2a",
       "Tags": [],
       "AvailableIpAddressCount": 4091,
       "DefaultForAz": true,
       "Ipv6CidrBlockAssociationSet": [],
       "VpcId": "vpc-1a2b3c4d",
       "State": "available",
       "MapPublicIpOnLaunch": true,
       "SubnetId": "subnet-1122aabb",
       "CidrBlock": "172.31.32.0/20",
       "AssignIpv6AddressOnCreation": false
   }
 }

Output

Subnet -> (structure)

Information about the subnet.

AvailabilityZoneId -> (string)

The AZ ID of the subnet.

EnableLniAtDeviceIndex -> (integer)

Indicates the device position for local network interfaces in this subnet. For example, 1 indicates local network interfaces in this subnet are the secondary network interface (eth1).

MapCustomerOwnedIpOnLaunch -> (boolean)

Indicates whether a network interface created in this subnet (including a network interface created by RunInstances ) receives a customer-owned IPv4 address.

CustomerOwnedIpv4Pool -> (string)

The customer-owned IPv4 address pool associated with the subnet.

OwnerId -> (string)

The ID of the Amazon Web Services account that owns the subnet.

AssignIpv6AddressOnCreation -> (boolean)

Indicates whether a network interface created in this subnet (including a network interface created by RunInstances ) receives an IPv6 address.

Ipv6CidrBlockAssociationSet -> (list)

Information about the IPv6 CIDR blocks associated with the subnet.

(structure)

Describes an association between a subnet and an IPv6 CIDR block.

AssociationId -> (string)

The ID of the association.

Ipv6CidrBlock -> (string)

The IPv6 CIDR block.

Ipv6CidrBlockState -> (structure)

The state of the CIDR block.

State -> (string)

The state of a CIDR block.

StatusMessage -> (string)

A message about the status of the CIDR block, if applicable.

Ipv6AddressAttribute -> (string)

Public IPv6 addresses are those advertised on the internet from Amazon Web Services. Private IP addresses are not and cannot be advertised on the internet from Amazon Web Services.

IpSource -> (string)

The source that allocated the IP address space. byoip or amazon indicates public IP address space allocated by Amazon or space that you have allocated with Bring your own IP (BYOIP). none indicates private space.

Tags -> (list)

Any tags assigned to the subnet.

(structure)

Describes a tag.

Key -> (string)

The key of the tag.

Constraints: Tag keys are case-sensitive and accept a maximum of 127 Unicode characters. May not begin with aws: .

Value -> (string)

The value of the tag.

Constraints: Tag values are case-sensitive and accept a maximum of 256 Unicode characters.

SubnetArn -> (string)

The Amazon Resource Name (ARN) of the subnet.

OutpostArn -> (string)

The Amazon Resource Name (ARN) of the Outpost.

EnableDns64 -> (boolean)

Indicates whether DNS queries made to the Amazon-provided DNS Resolver in this subnet should return synthetic IPv6 addresses for IPv4-only destinations.

Ipv6Native -> (boolean)

Indicates whether this is an IPv6 only subnet.

PrivateDnsNameOptionsOnLaunch -> (structure)

The type of hostnames to assign to instances in the subnet at launch. An instance hostname is based on the IPv4 address or ID of the instance.

HostnameType -> (string)

The type of hostname for EC2 instances. For IPv4 only subnets, an instance DNS name must be based on the instance IPv4 address. For IPv6 only subnets, an instance DNS name must be based on the instance ID. For dual-stack subnets, you can specify whether DNS names use the instance IPv4 address or the instance ID.

EnableResourceNameDnsARecord -> (boolean)

Indicates whether to respond to DNS queries for instance hostnames with DNS A records.

EnableResourceNameDnsAAAARecord -> (boolean)

Indicates whether to respond to DNS queries for instance hostname with DNS AAAA records.

BlockPublicAccessStates -> (structure)

The state of VPC Block Public Access (BPA).

InternetGatewayBlockMode -> (string)

The mode of VPC BPA.

  • off : VPC BPA is not enabled and traffic is allowed to and from internet gateways and egress-only internet gateways in this Region.
  • block-bidirectional : Block all traffic to and from internet gateways and egress-only internet gateways in this Region (except for excluded VPCs and subnets).
  • block-ingress : Block all internet traffic to the VPCs in this Region (except for VPCs or subnets which are excluded). Only traffic to and from NAT gateways and egress-only internet gateways is allowed because these gateways only allow outbound connections to be established.

SubnetId -> (string)

The ID of the subnet.

State -> (string)

The current state of the subnet.

VpcId -> (string)

The ID of the VPC the subnet is in.

CidrBlock -> (string)

The IPv4 CIDR block assigned to the subnet.

AvailableIpAddressCount -> (integer)

The number of unused private IPv4 addresses in the subnet. The IPv4 addresses for any stopped instances are considered unavailable.

AvailabilityZone -> (string)

The Availability Zone of the subnet.

DefaultForAz -> (boolean)

Indicates whether this is the default subnet for the Availability Zone.

MapPublicIpOnLaunch -> (boolean)

Indicates whether instances launched in this subnet receive a public IPv4 address.

Amazon Web Services charges for all public IPv4 addresses, including public IPv4 addresses associated with running instances and Elastic IP addresses. For more information, see the Public IPv4 Address tab on the Amazon VPC pricing page .