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Virtual Private Cloud:AllocateVpcIpv6Cidr

Last Updated:Dec 01, 2023

Reserves an IPv6 CIDR block.

Operation Description

The following section describes how to allocate an IPv6 CIDR block to a virtual private cloud (VPC):

  1. Call the AllocateVpcIpv6Cidr operation to reserve the IPv6 CIDR block.
  2. To allocate an IPv6 CIDR block to an existing VPC, call the AssociateVpcCidrBlock operation. Set RegionId, VpcId, and IPv6CidrBlock to the IPv6 CIDR bock, and set IpVersion to ipv6. To allocate an IPv6 CIDR block when you create a VPC, call the CreateVpc operation. Set RegionId and Ipv6CidrBlock to the IPv6 CIDR block, and set EnableIpv6 to true.


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Authorization information

The following table shows the authorization information corresponding to the API. The authorization information can be used in the Action policy element to grant a RAM user or RAM role the permissions to call this API operation. Description:

  • Operation: the value that you can use in the Action element to specify the operation on a resource.
  • Access level: the access level of each operation. The levels are read, write, and list.
  • Resource type: the type of the resource on which you can authorize the RAM user or the RAM role to perform the operation. Take note of the following items:
    • The required resource types are displayed in bold characters.
    • If the permissions cannot be granted at the resource level, All Resources is used in the Resource type column of the operation.
  • Condition Key: the condition key that is defined by the cloud service.
  • Associated operation: other operations that the RAM user or the RAM role must have permissions to perform to complete the operation. To complete the operation, the RAM user or the RAM role must have the permissions to perform the associated operations.
OperationAccess levelResource typeCondition keyAssociated operation
  • VPC

Request parameters


The region ID of the VPC.

You can call the DescribeRegions operation to query the most recent region list.


The client token that is used to ensure the idempotence of the request. You can use the client to generate the token, but you must make sure that the token is unique among different requests. The token can contain only ASCII characters.

Note If you do not specify this parameter, the system automatically uses the request ID as the client token. The request ID may be different for each request.

The type of IPv6 CIDR block. Valid values:

  • BGP (default)
  • ChinaMobile
  • ChinaUnicom
  • ChinaTelecom
  • If your Alibaba Cloud account is allowed to use single-ISP bandwidth, valid values are: ChinaTelecom, ChinaUnicom, and ChinaMobile.

  • You can reserve only one IPv6 CIDR block of each type. After a reserved IPv6 CIDR block of a type is allocated to a VPC, you can reserve another IPv6 CIDR of the type.


The type of the IPv6 address pool. Set the value to custom.

Note This parameter is required.

The IPv6 CIDR block that you want to reserve.


Response parameters


The IPv6 CIDR block that is reserved.


The request ID.



Sample success responses


  "Ipv6CidrBlock": "2408:XXXX:0:a600::/56",
  "RequestId": "D20C13EA-2584-53BC-8393-69DE6D98EFF1"

Error codes

HTTP status codeError codeError messageDescription
400OperationUnsupported.Ipv6FeatureThe IPv6 feature is not supported in the region.This region does not support IPv6.
400UnsupportedFeature.Ipv6IspThe Ipv6Isp feature is not supported.The specified IPv6 ISP is not supported.
400IllegalParam.AddressPoolTypeThe specified addressPoolType is invalid.The specified address pool type is invalid.
400ResourceNotEnough.Ipv6CidrThe specified resource ipv6 cidr is not enough.Insufficient IPv6 CIDR block resources.
400IllegalParam.Ipv6CidrThe specified Ipv6CidrBlock is invalid.Ipv6CidrBlock is set to an invalid value.
400Unavailable.Ipv6CidrThe specified resource ipv6 cidr is not available.The specified IPv6 CIDR block is unavailable.

For a list of error codes, visit the Service error codes.

Change history

Change timeSummary of changesOperation
2023-07-20The error codes of the API operation change.see changesets
Change itemChange content
Error CodesThe error codes of the API operation change.
    Error Codes 400 change