**To create a subnet** This example creates a subnet in the specified VPC with the specified IPv4 CIDR block. We recommend that you let us select an Availability Zone for you. Alternatively, you can use the ``--availability-zone`` option to specify the Availability Zone. Command:: aws ec2 create-subnet --vpc-id vpc-a01106c2 --cidr-block 10.0.1.0/24 Output:: { "Subnet": { "VpcId": "vpc-a01106c2", "AvailableIpAddressCount": 251, "MapPublicIpOnLaunch": false, "DefaultForAz": false, "Ipv6CidrBlockAssociationSet": [], "State": "pending", "AvailabilityZone": "us-east-1a", "SubnetId": "subnet-2c2de375", "CidrBlock": "10.0.1.0/24", "AssignIpv6AddressOnCreation": false } } **To create a subnet with an IPv6 CIDR block** This example creates a subnet in the specified VPC with the specified IPv4 and IPv6 CIDR blocks (from the ranges of the VPC). Command:: aws ec2 create-subnet --vpc-id vpc-31896b55 --cidr-block 10.0.0.0/24 --ipv6-cidr-block 2001:db8:1234:a100::/64 Output:: { "Subnet": { "VpcId": "vpc-31896b55", "AvailableIpAddressCount": 251, "MapPublicIpOnLaunch": false, "DefaultForAz": false, "Ipv6CidrBlockAssociationSet": [ { "Ipv6CidrBlock": "2001:db8:1234:a100::/64", "AssociationId": "subnet-cidr-assoc-3fe7e347", "Ipv6CidrBlockState": { "State": "ASSOCIATING" } } ], "State": "pending", "AvailabilityZone": "ap-southeast-2a", "SubnetId": "subnet-5504d223", "CidrBlock": "10.0.0.0/24", "AssignIpv6AddressOnCreation": false } }