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Anti-DDoS:DescribeCnameReuses

Last Updated:Nov 05, 2025

Queries the CNAME reuse information about websites.

Operation description

This operation is applicable only to Anti-DDoS Proxy (Outside Chinese Mainland).

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RAM authorization

The table below describes the authorization required to call this API. You can define it in a Resource Access Management (RAM) policy. The table's columns are detailed below:

  • Action: The actions can be used in the Action element of RAM permission policy statements to grant permissions to perform the operation.

  • API: The API that you can call to perform the action.

  • Access level: The predefined level of access granted for each API. Valid values: create, list, get, update, and delete.

  • Resource type: The type of the resource that supports authorization to perform the action. It indicates if the action supports resource-level permission. The specified resource must be compatible with the action. Otherwise, the policy will be ineffective.

    • For APIs with resource-level permissions, required resource types are marked with an asterisk (*). Specify the corresponding Alibaba Cloud Resource Name (ARN) in the Resource element of the policy.

    • For APIs without resource-level permissions, it is shown as All Resources. Use an asterisk (*) in the Resource element of the policy.

  • Condition key: The condition keys defined by the service. The key allows for granular control, applying to either actions alone or actions associated with specific resources. In addition to service-specific condition keys, Alibaba Cloud provides a set of common condition keys applicable across all RAM-supported services.

  • Dependent action: The dependent actions required to run the action. To complete the action, the RAM user or the RAM role must have the permissions to perform all dependent actions.

Action

Access level

Resource type

Condition key

Dependent action

yundun-ddoscoo:DescribeCnameReuses

get

*All Resource

*

None None

Request parameters

Parameter

Type

Required

Description

Example

ResourceGroupId

string

No

The ID of the resource group to which the Anti-DDoS Proxy instance belongs in Resource Management. This parameter is empty by default, which indicates that the instance belongs to the default resource group.

default

Domains

array

Yes

The domain names of the websites. You can specify the domain names of up to 200 websites.

Note

A forwarding rule must be configured for the domain name. You can call DescribeDomains to query all domain names.

www.aliyun.com

string

No

The domain name of the website.

www.aliyun.com

Response elements

Parameter

Type

Description

Example

object

RequestId

string

The ID of the request.

0bcf28g5-d57c-11e7-9bs0-d89d6717dxbc

CnameReuses

array

The CNAME reuse information.

object

Domain

string

The domain name of the website.

www.aliyun.com

Cname

string

The reused canonical name value.

4o6ep6q217k9****.aliyunddos0004.com

Enable

integer

Indicates whether CNAME reuse is enabled. Valid values:

  • 0: disabled

  • 1: enabled

1

Examples

Success response

JSON format

{
  "RequestId": "0bcf28g5-d57c-11e7-9bs0-d89d6717dxbc",
  "CnameReuses": [
    {
      "Domain": "www.aliyun.com",
      "Cname": "4o6ep6q217k9****.aliyunddos0004.com",
      "Enable": 1
    }
  ]
}

Error codes

See Error Codes for a complete list.

Release notes

See Release Notes for a complete list.