Use DescribeIdentityIdFormat with an Amazon SDK or CLI

To describe the ID format for an IAM role

The following describe-identity-id-format example describes the ID format received by instances created by the IAM role EC2Role in your Amazon account.

aws ec2 describe-identity-id-format \
    --principal-arn arn:aws:iam::123456789012:role/my-iam-role \
    --resource instance

The following output indicates that instances created by this role receive IDs in long ID format.

{
    "Statuses": [
        {
            "Deadline": "2016-12-15T00:00:00Z",
            "Resource": "instance",
            "UseLongIds": true
        }
    ]
}

To describe the ID format for an IAM user

The following describe-identity-id-format example describes the ID format received by snapshots created by the IAM user AdminUser in your Amazon account.

aws ec2 describe-identity-id-format \
    --principal-arn arn:aws:iam::123456789012:user/AdminUser \
    --resource snapshot

The output indicates that snapshots created by this user receive IDs in long ID format.

{
    "Statuses": [
        {
            "Deadline": "2016-12-15T00:00:00Z",
            "Resource": "snapshot",
            "UseLongIds": true
        }
    ]
}

Example 1: This example returns the ID format for the resouce 'image' for the role given

Get-EC2IdentityIdFormat -PrincipalArn arn:aws:iam::123456789511:role/JDBC -Resource image

Output:

Deadline             Resource UseLongIds
--------             -------- ----------
8/2/2018 11:30:00 PM image    True