> For the complete documentation index, see [llms.txt](https://docs.console.zenlayer.com/api-reference/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.console.zenlayer.com/api-reference/networking/sdn/cloud-router/describecloudrouteravailablevpcs.md).

# DescribeCloudRouterAvailableVpcs

## 1. API Description

This API (DescribeCloudRouterAvailableVpcs) is used to query Available VPCs

## 2. Input Parameters

The following request parameter list only provides API request parameters.

| Parameter Name | Required | Type    | Description                                                      |
| -------------- | -------- | ------- | ---------------------------------------------------------------- |
| vpcId          | No       | String  | VPC ID.                                                          |
| pageSize       | No       | Integer | Page size to return. Default: 20, maximum: 100.                  |
| pageNum        | No       | Integer | <p>Page number to return. Default: 1.</p><p>Default value: 1</p> |

## 3. Output Parameters

| Parameter Name | Type                                                                                                       | Description                                                                                                           |
| -------------- | ---------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------- |
| requestId      | String                                                                                                     | <p>The unique request ID, which is returned for each request.</p><p>RequestId is required for locating a problem.</p> |
| totalCount     | Integer                                                                                                    | Total number of VPCs matching the criteria.                                                                           |
| dataSet        | Array of [CloudRouterAvailableVpc](/api-reference/networking/sdn/datastructure.md#cloudrouteravailablevpc) | List of VPCs that can be added to the Cloud Router.                                                                   |

## 4. Code Example

{% tabs %}
{% tab title="Example" %}
**1. Get the list of VPCs that can join a Cloud Router.**

```json
POST /api/v2/sdn HTTP/1.1
Host: console.zenlayer.com
Content-Type: application/json
X-ZC-Action: DescribeCloudRouterAvailableVpcs
<Common Request Params>

Request:
{
  "vpcId": "your-vpc-id",
  "pageSize": 20,
  "pageNum": 1
}

Response:
{
  "requestId": "T05992D0C-7E8B-4047-B0C0-780F2CD549D3",
  "response": {
    "requestId":"TB1F3B1A1-DA70-4FF7-99D1-CEBEEFBAC95F",
    "totalCount":1,
    "dataSet":[
        {
            "vpcName":"VPC-MAD-A-01",
            "dataCenter":{
                "dcId":"MAD1",
                "cityName":"Madrid",
                "areaName":"Europe",
                "dcName":"Interxion_MAD2 ",
                "dcAddress":"Calle Albasanz, 73, Madrid, 28037, Spain",
                "countryName":"Spain",
                "latitude":40.4168,
                "longitude":-3.7038
            },
            "vpcId":"your-vpc-id",
            "cidrBlock":"10.0.0.0/8"
        }
    ]
  }
}
```

{% endtab %}
{% endtabs %}

## 5. Developer Resources

Zenlayer Cloud API 2.0 integrates [SDKs](/api-reference/api-introduction/toolkit/api-sdk.md)，to make it easier for you to call APIs. More programming languages will be supported.

## 6. Error Codes

The following only lists the error codes related to the API business logic. For other error codes, see [Common Error Codes](/api-reference/api-introduction/instruction/commonerrorcode.md).

| HTTP Status Code | Error Code | Description |
| ---------------- | ---------- | ----------- |