> 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/bmc/cidr-block/createipv6block.md).

# CreateIpv6Block

## 1. API Description

This API (CreateIpv6Block) is used to create one or more IPv6 CIDR blocks.

#### Prerequisites

* Query stock: call [`DescribeAvailableIpv6Resources`](/api-reference/bmc/cidr-block/describeavailableipv6resources.md) to check available resources.

{% hint style="info" %} <mark style="color:blue;">**Note**</mark>

* <mark style="color:blue;">An IPv6 CIDR block contains 500 available IPs.</mark>
* <mark style="color:blue;">This API is an async API. A CIDR block ID list is returned after the creation request is sent. However, it does not mean the creation has been completed. The status of the CIDR block will be</mark> <mark style="color:blue;">`CREATING`</mark> <mark style="color:blue;">during the creation. You can use</mark> [<mark style="color:blue;"><mark style="color:purple;">DescribeCidrBlocks<mark style="color:purple;"></mark>](/api-reference/bmc/cidr-block/describecidrblocks.md) <mark style="color:blue;">to query the status of the CIDR block. If the status changes from</mark> <mark style="color:blue;">`Creating`</mark> <mark style="color:blue;">to</mark> <mark style="color:blue;">`Available`</mark><mark style="color:blue;">, it means that the CIDR block has been created successfully;</mark> <mark style="color:blue;">`CREATE_FAILED`</mark> <mark style="color:blue;">means the CIDR block has been created failed. Any operations on the instances are not allowed while creating.</mark>
  {% endhint %}

## 2. Input Parameters

The following request parameter list only provides API request parameters.

| Parameter Name  | Required | Type                                                                 | Description                                                                                                                                                                                                              |
| --------------- | -------- | -------------------------------------------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |
| zoneId          | Yes      | String                                                               | Zone ID to which the CIDR blocks belong.                                                                                                                                                                                 |
| name            | No       | String                                                               | <p>CIDR block name to be displayed.</p><p>This parameter can contain up to 64 characters.</p>                                                                                                                            |
| amount          | No       | Integer                                                              | <p>Quantity of IPv6 CIDR blocks you want to purchase.</p><p>Default value: 1.</p><p>Value range: \[1, +)</p>                                                                                                             |
| resourceGroupId | No       | String                                                               | <p>Resource group ID where the CIDR blocks reside.</p><p>If an available VLAN exists in the specified zone, this parameter will be ignored. The created CIDR blocks will be added to the resource group of the VLAN.</p> |
| tags            | No       | [TagAssociation](/api-reference/bmc/datastructure.md#tagassociation) | <p>Bound tags when creating resources.</p><p>Tag keys must be unique.</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> |
| cidrBlockIds   | Array of String | List of CIDR block IDs.                                                                                               |

## 4. Code Example

{% tabs %}
{% tab title="Example" %}
Create an IPv6 CIDR block `example` in `IST-B`, belonging to `Default Resource Group`.

```json
POST /api/v2/bmc HTTP/1.1
Host: console.zenlayer.com
Content-Type: application/json
X-ZC-Action: CreateIpv6Block
<Common Request Params>

Request:
{
  "zoneId": "ISB-B",
  "name": "example",
  "amount": 1
}

Response:
{
  "requestId": "T17BD4918-239C-4633-9F3A-9D2D5E0BA4E2",
  "response": {
    "requestId": "T17BD4918-239C-4633-9F3A-9D2D5E0BA4E2",
    "cidrBlockIds": [
      "cidrBlockId"
    ]
  }
}
```

{% 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     |
| ---------------- | ------------------------- | --------------- |
| 404              | INVALID\_ZONE\_NOT\_FOUND | Zone not found. |