**Example 1: To create a subnet with an IPv4 CIDR block only** The following ``create-subnet`` example creates a subnet in the specified VPC with the specified IPv4 CIDR block. :: aws ec2 create-subnet \ --vpc-id vpc-081ec835f3EXAMPLE \ --cidr-block 10.0.0.0/24 \ --tag-specifications ResourceType=subnet,Tags=[{Key=Name,Value=my-ipv4-only-subnet}] Output:: { "Subnet": { "AvailabilityZone": "us-west-2a", "AvailabilityZoneId": "usw2-az2", "AvailableIpAddressCount": 251, "CidrBlock": "10.0.0.0/24", "DefaultForAz": false, "MapPublicIpOnLaunch": false, "State": "available", "SubnetId": "subnet-0e99b93155EXAMPLE", "VpcId": "vpc-081ec835f3EXAMPLE", "OwnerId": "123456789012", "AssignIpv6AddressOnCreation": false, "Ipv6CidrBlockAssociationSet": [], "Tags": [ { "Key": "Name", "Value": "my-ipv4-only-subnet" } ], "SubnetArn": "arn:aws:ec2:us-west-2:123456789012:subnet/subnet-0e99b93155EXAMPLE" } } **Example 2: To create a subnet with both IPv4 and IPv6 CIDR blocks** The following ``create-subnet`` example creates a subnet in the specified VPC with the specified IPv4 and IPv6 CIDR blocks. :: aws ec2 create-subnet \ --vpc-id vpc-081ec835f3EXAMPLE \ --cidr-block 10.0.0.0/24 \ --ipv6-cidr-block 2600:1f16:cfe:3660::/64 \ --tag-specifications ResourceType=subnet,Tags=[{Key=Name,Value=my-ipv4-ipv6-subnet}] Output:: { "Subnet": { "AvailabilityZone": "us-west-2a", "AvailabilityZoneId": "usw2-az2", "AvailableIpAddressCount": 251, "CidrBlock": "10.0.0.0/24", "DefaultForAz": false, "MapPublicIpOnLaunch": false, "State": "available", "SubnetId": "subnet-0736441d38EXAMPLE", "VpcId": "vpc-081ec835f3EXAMPLE", "OwnerId": "123456789012", "AssignIpv6AddressOnCreation": false, "Ipv6CidrBlockAssociationSet": [ { "AssociationId": "subnet-cidr-assoc-06c5f904499fcc623", "Ipv6CidrBlock": "2600:1f13:cfe:3660::/64", "Ipv6CidrBlockState": { "State": "associating" } } ], "Tags": [ { "Key": "Name", "Value": "my-ipv4-ipv6-subnet" } ], "SubnetArn": "arn:aws:ec2:us-west-2:123456789012:subnet/subnet-0736441d38EXAMPLE" } } **Example 3: To create a subnet with an IPv6 CIDR block only** The following ``create-subnet`` example creates a subnet in the specified VPC with the specified IPv6 CIDR block. :: aws ec2 create-subnet \ --vpc-id vpc-081ec835f3EXAMPLE \ --ipv6-native \ --ipv6-cidr-block 2600:1f16:115:200::/64 \ --tag-specifications ResourceType=subnet,Tags=[{Key=Name,Value=my-ipv6-only-subnet}] Output:: { "Subnet": { "AvailabilityZone": "us-west-2a", "AvailabilityZoneId": "usw2-az2", "AvailableIpAddressCount": 0, "DefaultForAz": false, "MapPublicIpOnLaunch": false, "State": "available", "SubnetId": "subnet-03f720e7deEXAMPLE", "VpcId": "vpc-081ec835f3EXAMPLE", "OwnerId": "123456789012", "AssignIpv6AddressOnCreation": true, "Ipv6CidrBlockAssociationSet": [ { "AssociationId": "subnet-cidr-assoc-01ef639edde556709", "Ipv6CidrBlock": "2600:1f13:cfe:3660::/64", "Ipv6CidrBlockState": { "State": "associating" } } ], "Tags": [ { "Key": "Name", "Value": "my-ipv6-only-subnet" } ], "SubnetArn": "arn:aws:ec2:us-west-2:123456789012:subnet/subnet-03f720e7deEXAMPLE" } } For more information, see `VPCs and subnets <https://docs.aws.amazon.com/vpc/latest/userguide/VPC_Subnets.html>`__ in the *Amazon VPC User Guide*.