> 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/cn/bmc/cidr-block/describeinstanceavailablecidrblock.md).

# DescribeInstanceAvailableCidrBlock

## 1. 接口描述

本接口(DescribeInstanceAvailableCidrBlock)用于查询实例可用的Cidr Block。

## 2. 请求参数

以下请求参数列表仅列出了接口中需要的请求参数

| 参数名称          | 必选 | 类型                                                      | 描述                                                          |
| ------------- | -- | ------------------------------------------------------- | ----------------------------------------------------------- |
| instanceId    | 是  | String                                                  | <p>实例ID。</p><p>可通过DescribeInstances接口返回值中的instanceId获取。</p> |
| cidrBlockType | 否  | [IpType](/api-reference/cn/bmc/datastructure.md#iptype) | CIDR地址块的类型。                                                 |

## 3. 响应结果

| 参数名称                        | 类型                                                                                                       | 描述                                                       |
| --------------------------- | -------------------------------------------------------------------------------------------------------- | -------------------------------------------------------- |
| requestId                   | String                                                                                                   | <p>唯一请求 ID。</p><p>每次请求都会返回。定位问题时需要提供该次请求的 requestId。</p> |
| instanceAvailableCidrBlocks | Array of [InstanceAvailableCidrBlock](/api-reference/cn/bmc/datastructure.md#instanceavailablecidrblock) | 实例可用的Cidr Block列表。                                       |

## 4. 代码示例

{% tabs %}
{% tab title="示例" %}
**1. 查询指定实例指定类型可用的Cidr Block** 查询实例 **`123456`** 可用的 **`Ipv4`** Cidr Block。

```json
POST /api/v2/bmc HTTP/1.1
Host: console.zenlayer.com
Content-Type: application/json
X-ZC-Action: DescribeInstanceAvailableCidrBlock
Request:
{
  "instanceId": "123456",
  "cidrBlockType": "IPV4"
}
Response:
{
  "requestId": "TD558E499-305A-45CF-A416-8BAD3DCFFFA4",
  "response": {
    "requestId": "TD558E499-305A-45CF-A416-8BAD3DCFFFA4",
    "instanceAvailableCidrBlocks": [
      {
        "cidrBlockId": "d6ea77ad-fd05-4383-b973-93703bddaa79",
        "zoneId": "SEL-A",
        "cidrBlockType": "IPV4",
        "cidrBlock": "1.1.1.48/29",
        "availableIps": [
          "1.1.1.50",
          "1.1.1.51",
          "1.1.1.52",
          "1.1.1.53",
          "1.1.1.54"
        ],
        "availableIpCount": 5
      },
      {
        "cidrBlockId": "50a242cb-172d-4ebe-824b-f484bbfee803",
        "zoneId": "SEL-A",
        "cidrBlockType": "IPV4",
        "cidrBlock": "2.2.2.56/29",
        "availableIps": [
          "2.2.2.58",
          "2.2.2.59",
          "2.2.2.60",
          "2.2.2.61",
          "2.2.2.62"
        ],
        "availableIpCount": 5
      }
    ]
  }
}
```

{% endtab %}
{% endtabs %}

## 5. 开发者工具

Zenlayer Cloud API 2.0 提供了配套的[开发工具集（SDK）](/api-reference/cn/api-introduction/toolkit.md)，未来会陆续支持更多开发语言，方便快速接入和使用Zenlayer的产品和服务。

## 6. 错误码

下面包含业务逻辑中遇到的错误码，其他错误码见[公共错误码](/api-reference/cn/api-introduction/instruction/commonerrorcode.md)

| HTTP状态码 | 错误码 | 说明 |
| ------- | --- | -- |