This API is used to query the number of instances, that is, the number of CMKs created.

Default Master Keys are automatically created by services and are not included in this query.

**Table 1** Parameter description
Parameter	Mandatory	Type	Description
project_id	Yes	String	Project ID

None

**Table 2** Response parameters
Parameter	Mandatory	Type	Description
instance_num	Yes	Integer	Number of non-default CMKs

Example response

{ 
    "instance_num": 15
}

or

{
    "error": {
        "error_code": "KMS.XXXX",
        "error_msg": "XXX"
    }
}

Table 3 lists the normal status code returned by the response.

**Table 3** Status codes
Status Code	Status	Description
200	OK	Request processed successfully.

Exception status code. For details, see Status Codes.

Querying the Number of Instances