To create an internet gateway

The following create-internet-gateway example creates an internet gateway with the tag Name=my-igw.

aws ec2 create-internet-gateway \
    --tag-specifications ResourceType=internet-gateway,Tags=[{Key=Name,Value=my-igw}]

Output:

{
    "InternetGateway": {
        "Attachments": [],
        "InternetGatewayId": "igw-0d0fb496b3994d755",
        "OwnerId": "123456789012",
        "Tags": [
            {
                "Key": "Name",
                "Value": "my-igw"
            }
        ]
    }
}

For more information, see Internet gateways in the Amazon VPC User Guide.