> 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/compute/zec/cidr-block/createcidr.md). # CreateCidr ## 1. API Description This API (CreateCidr) is used to create a CIDR block. ## 2. Input Parameters The following request parameter list only provides API request parameters. | Parameter Name | Required | Type | Description | | ----------------------- | -------- | ------------------------------------------------------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | | regionId | Yes | String | Region ID. | | netmask | Yes | [NetmaskInfo](/api-reference/compute/zec/datastructure.md#netmaskinfo) | CIDR block size and quantity. | | eipV4Type \[Deprecated] | No | [EipNetworkType](/api-reference/compute/zec/datastructure.md#eipnetworktype) |

Network types of public IPv4.

Deprecated. Please use networkLineType instead.

| | networkLineType | No | [NetworkLineType](/api-reference/compute/zec/datastructure.md#networklinetype) | Network types of public IPv4. | | name | No | String |

CIDR block name.

Length: 2–63 characters. Allowed characters: letters (A–Z, a–z), numbers (0–9), hyphen ( - ), slash ( / ), underscore ( \_ ), and period ( . ) Must start and end with a letter or number. If not specified, the assigned CIDR address will be used as the default name.

| | resourceGroupId | No | String | Resource group ID. | | marketingOptions | No | [MarketingInfo](/api-reference/compute/zec/datastructure.md#marketinginfo) | Information on marketing campaigns. | | tags | No | [TagAssociation](/api-reference/compute/zec/datastructure.md#tagassociation) |

Bound tags when creating the cidr block.

Tag keys must be unique.

| ## 3. Output Parameters | Parameter Name | Type | Description | | -------------- | --------------- | --------------------------------------------------------------------------------------------------------------------- | | requestId | String |

The unique request ID, which is returned for each request.

RequestId is required for locating a problem.

| | cidrIds | Array of String | ID list of created CIDR blocks. | ## 4. Code Example {% tabs %} {% tab title="Example" %} **Create a CIDR block.** 
POST /api/v2/zec HTTP/1.1
Host: console.zenlayer.com
Content-Type: application/json
X-ZC-Action: CreateCidr


Request:
{
  "regionId": "asia-east-1",
  "eipV4Type": "BGP_LINE",
  "netmask": {
    "netmask": 30,
    "amount": 1
  }
}

Response:
{
  "requestId": "TBFC01FCF-6439-4530-ADBC-16809F0C3E8F",
  "response": {
    "requestId": "TBFC01FCF-6439-4530-ADBC-16809F0C3E8F"
  }
}
{% 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 | | ---------------- | -------------------------------------------------- | ------------------------------------------------ | | 400 | OPERATION\_DENIED\_EIP\_UNSUPPORTED\_NETWORK\_TYPE | The EIP network billing method is not supported. | | 400 | OPERATION\_DENIED\_CIDR\_INSUFFICIENT | Insufficient CIDR blocks. |