Help Center/ Elastic Load Balance/ API Reference/ APIs (V3)/ Reserved IP Address/ Calculating the Number of Reserved IP Addresses
Updated on 2025-09-22 GMT+08:00
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Calculating the Number of Reserved IP Addresses

Function

This API is used to calculate the number of reserved IP addresses in the following scenarios:

  • To calculate the number of IP addresses required for creating a load balancer, specify availability_zone_id and optional parameters l7_flavor_id, ip_target_enable, and ip_version. Do not specify loadbalancer_id.

  • To calculate the number of IP addresses required for adding the first Layer 7 listener to a load balancer, specify loadbalancer_id and do not specify other parameters.

  • To calculate the number of IP addresses required for changing the flavors of a dedicated load balancer or enabling IP as a Backend, specify loadbalancer_id and l7_flavor_id, or specify loadbalancer_id and set ip_target_enable to true. You can specify l7_flavor_id and set ip_target_enable to true to calculate the number of IP addresses required for multiple changes.

  • To calculate the number of IP addresses required for upgrading a shared load balancer, specify loadbalancer_id and scene, and do not specify other parameters.

  • To calculate the number of IP addresses required for enabling nat64_enable, specify nat64_enable and loadbalancer_id, and do not specify other parameters.

Note:

  • The number of reserved IP addresses in the query result is greater than that of the actually used IP addresses.

  • The number of reserved IP addresses does not include those already assigned or in use.

Calling Method

For details, see Calling APIs.

URI

GET /v3/{project_id}/elb/preoccupy-ip-num

Table 1 Path Parameters

Parameter

Mandatory

Type

Description

project_id

Yes

String

Definition: Specifies the project ID. For details about how to obtain a project ID, see Obtaining a Project ID.

Constraints: N/A

Range: The value can contain a maximum of 32 characters, including digits and lowercase letters.

Default value: N/A
Table 2 Query Parameters

Parameter

Mandatory

Type

Description

l7_flavor_id

No

String

Definition: Specifies the ID of the load balancer flavor at Layer 7. If this parameter is passed, the number of reserved IP addresses required for creating a dedicated load balancer with a Layer 7 flavor or for changing the Layer 7 flavor of a dedicated load balancer will be calculated.

Constraints: This parameter can only be used for creating a dedicated load balancer with a Layer 7 flavor or changing the Layer 7 flavor of a dedicated load balancer

Range: N/A

Default value: N/A

ip_target_enable

No

Boolean

Definition: Whether to enable IP as a Backend.

Constraints: This parameter can only be used for creating a dedicated load balancer with IP as a Backend enabled or for enabling IP as a Backend for an existing dedicated load balancer.

Range:

  • true: The number of reserved IP addresses required for creating a dedicated load balancer with IP as a Backend enabled or for enabling IP as a Backend for an existing dedicated load balancer will be calculated.

  • false: The number of reserved IP addresses required for creating a dedicated load balancer with IP as a Backend disabled will be calculated.

  • If this parameter is not passed, IP as a Backend is disabled.

Default value: false

ip_version

No

Integer

Definition: Specifies the IP address version of the load balancer. The value can be 4 or 6.

Constraints: This parameter can be used for creating a load balancer.

Range:

  • 4: The number of reserved IPv4 addresses required for creating a load balancer will be calculated.

  • 6: The number of reserved IPv6 addresses required for creating a load balancer will be calculated.

Default value: N/A

loadbalancer_id

No

String

Definition: Specifies the load balancer ID. The number of reserved IP addresses required for changing the flavors of a load balancer or for adding the first Layer 7 listener to a load balancer will be calculated.

Constraints: This parameter can be used for changing the flavors of a load balancer, enabling IP as a Backend for an existing load balancer, enabling or disabling nat64_enable, or adding the first Layer 7 listener to a load balancer.

Range: N/A

Default value: N/A

availability_zone_id

No

Array of strings

Definition: Calculates the number of reserved IP addresses required for creating a load balancer in the AZs specified by availability_zone_id.

Constraints:

  • This parameter can only be used for creating a load balancer.

  • This parameter is invalid if loadbalancer_id is specified.

Range: N/A

Default value: N/A

scene

No

String

Definition: Calculates the number of IP addresses required for upgrading a shared load balancer to a dedicated load balancer.

Constraints:

  • This parameter can only be used for upgrading a shared load balancer to a dedicated load balancer.

  • Both this parameter and loadbalancer_id must be specified.

Range: UPGRADE (upgrading a shared load balancer to a dedicated load balancer)

Default value: N/A

nat64_enable

No

Boolean

Definition: Specifies whether to enable nat64_enable. If this parameter is specified, the system will calculate the number of reserved IP addresses required for creating a load balancer whose listeners have nat64_enable enabled or disabled, or for enabling or disabling nat64_enable for the listeners of a specific load balancer.

Constraints:

  • This parameter can only be used for calculating the number of reserved IP addresses required for enabling nat64_enable for the listeners of a load balancer.

Range:

  • true: Enable nat64_enable.

  • false: Disable nat64_enable.

Default value: false

Request Parameters

Table 3 Request header parameters

Parameter

Mandatory

Type

Description

X-Auth-Token

Yes

String

Definition: Specifies the token used for IAM authentication.

Constraints: N/A

Range: N/A

Default value: N/A

Response Parameters

Status code: 200

Table 4 Response body parameters

Parameter

Type

Description

preoccupy_ip

PreoccupyIp object

Definition: Specifies reserved IP address.

request_id

String

Definition: Specifies the request ID.

Range: The value is automatically generated, and can contain characters including digits, lowercase letters, and hyphens (-).
Table 5 PreoccupyIp

Parameter

Type

Description

total

Integer

Definition: Specifies the number of preoccupied IP addresses.

Range: an integer no less than 0

Example Requests

  • Querying the number of reserved IP addresses required for changing the Layer 7 flavor of a dedicated load balancer

    https://{ELB_Endpoint}/v3/060576782980d5762f9ec014dd2f1148/elb/preoccupy-ip-num?loadbalancer_id=aff4fc31-d635-4f59-a862-edadf32e407d&l7_flavor_id=0051bc4c-a562-4b7c-953b-a250b51d992b

{
  "preoccupy_ip" : {
    "total" : 6
  },
  "request_id" : "8844e9a0-6a2d-44b7-aad9-15a7f75e4059"
}

  • Querying the number of reserved IP addresses required for creating a dedicated load balancer that is deployed in two AZs and has IP as a Backend enabled

    GET /v3/{project_id}/elb/preoccupy-ip-num?l7_flavor_id=8278944d-f92c-4393-82b2-6fb9cc1d7e53&availability_zone_id=az1&availability_zone_id=az2&ip_target_enable=true

{
  "preoccupy_ip" : {
    "total" : 20
  },
  "request_id" : "63388ec8-fa3c-4c99-b9c8-d2c83b2a9a68"
}

  • Querying the number of reserved IP addresses required for adding the first HTTP or HTTPS listener to a dedicated load balancer

    GET /v3/{project_id}/elb/preoccupy-ip-num?loadbalancer_id=aff4fc31-d635-4f59-a862-edadf32e407d

{
  "preoccupy_ip" : {
    "total" : 2
  },
  "request_id" : "febfce48-318d-45ba-a9d9-855462123f3b"
}

Example Responses

Status code: 200

Successful request.

{
  "preoccupy_ip" : {
    "total" : 20
  },
  "request_id" : "63388ec8-fa3c-4c99-b9c8-d2c83b2a9a68"
}

SDK Sample Code

The SDK sample code is as follows.

  • Querying the number of reserved IP addresses required for changing the Layer 7 flavor of a dedicated load balancer

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    package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.elb.v3.region.ElbRegion;
import com.huaweicloud.sdk.elb.v3.*;
import com.huaweicloud.sdk.elb.v3.model.*;


public class CountPreoccupyIpNumSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        ElbClient client = ElbClient.newBuilder()
                .withCredential(auth)
                .withRegion(ElbRegion.valueOf("<YOUR REGION>"))
                .build();
        CountPreoccupyIpNumRequest request = new CountPreoccupyIpNumRequest();
        try {
            CountPreoccupyIpNumResponse response = client.countPreoccupyIpNum(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

  • Querying the number of reserved IP addresses required for creating a dedicated load balancer that is deployed in two AZs and has IP as a Backend enabled

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    package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.elb.v3.region.ElbRegion;
import com.huaweicloud.sdk.elb.v3.*;
import com.huaweicloud.sdk.elb.v3.model.*;


public class CountPreoccupyIpNumSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        ElbClient client = ElbClient.newBuilder()
                .withCredential(auth)
                .withRegion(ElbRegion.valueOf("<YOUR REGION>"))
                .build();
        CountPreoccupyIpNumRequest request = new CountPreoccupyIpNumRequest();
        try {
            CountPreoccupyIpNumResponse response = client.countPreoccupyIpNum(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

  • Querying the number of reserved IP addresses required for adding the first HTTP or HTTPS listener to a dedicated load balancer

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    package com.huaweicloud.sdk.test;

import com.huaweicloud.sdk.core.auth.ICredential;
import com.huaweicloud.sdk.core.auth.BasicCredentials;
import com.huaweicloud.sdk.core.exception.ConnectionException;
import com.huaweicloud.sdk.core.exception.RequestTimeoutException;
import com.huaweicloud.sdk.core.exception.ServiceResponseException;
import com.huaweicloud.sdk.elb.v3.region.ElbRegion;
import com.huaweicloud.sdk.elb.v3.*;
import com.huaweicloud.sdk.elb.v3.model.*;


public class CountPreoccupyIpNumSolution {

    public static void main(String[] args) {
        // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
        // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
        String ak = System.getenv("CLOUD_SDK_AK");
        String sk = System.getenv("CLOUD_SDK_SK");
        String projectId = "{project_id}";

        ICredential auth = new BasicCredentials()
                .withProjectId(projectId)
                .withAk(ak)
                .withSk(sk);

        ElbClient client = ElbClient.newBuilder()
                .withCredential(auth)
                .withRegion(ElbRegion.valueOf("<YOUR REGION>"))
                .build();
        CountPreoccupyIpNumRequest request = new CountPreoccupyIpNumRequest();
        try {
            CountPreoccupyIpNumResponse response = client.countPreoccupyIpNum(request);
            System.out.println(response.toString());
        } catch (ConnectionException e) {
            e.printStackTrace();
        } catch (RequestTimeoutException e) {
            e.printStackTrace();
        } catch (ServiceResponseException e) {
            e.printStackTrace();
            System.out.println(e.getHttpStatusCode());
            System.out.println(e.getRequestId());
            System.out.println(e.getErrorCode());
            System.out.println(e.getErrorMsg());
        }
    }
}

  • Querying the number of reserved IP addresses required for changing the Layer 7 flavor of a dedicated load balancer

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    # coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkelb.v3.region.elb_region import ElbRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkelb.v3 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = ElbClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(ElbRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = CountPreoccupyIpNumRequest()
        response = client.count_preoccupy_ip_num(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

  • Querying the number of reserved IP addresses required for creating a dedicated load balancer that is deployed in two AZs and has IP as a Backend enabled

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    # coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkelb.v3.region.elb_region import ElbRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkelb.v3 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = ElbClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(ElbRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = CountPreoccupyIpNumRequest()
        response = client.count_preoccupy_ip_num(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

  • Querying the number of reserved IP addresses required for adding the first HTTP or HTTPS listener to a dedicated load balancer

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    # coding: utf-8

import os
from huaweicloudsdkcore.auth.credentials import BasicCredentials
from huaweicloudsdkelb.v3.region.elb_region import ElbRegion
from huaweicloudsdkcore.exceptions import exceptions
from huaweicloudsdkelb.v3 import *

if __name__ == "__main__":
    # The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    # In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak = os.environ["CLOUD_SDK_AK"]
    sk = os.environ["CLOUD_SDK_SK"]
    projectId = "{project_id}"

    credentials = BasicCredentials(ak, sk, projectId)

    client = ElbClient.new_builder() \
        .with_credentials(credentials) \
        .with_region(ElbRegion.value_of("<YOUR REGION>")) \
        .build()

    try:
        request = CountPreoccupyIpNumRequest()
        response = client.count_preoccupy_ip_num(request)
        print(response)
    except exceptions.ClientRequestException as e:
        print(e.status_code)
        print(e.request_id)
        print(e.error_code)
        print(e.error_msg)

  • Querying the number of reserved IP addresses required for changing the Layer 7 flavor of a dedicated load balancer

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    package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    elb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := elb.NewElbClient(
        elb.ElbClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.CountPreoccupyIpNumRequest{}
	response, err := client.CountPreoccupyIpNum(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

  • Querying the number of reserved IP addresses required for creating a dedicated load balancer that is deployed in two AZs and has IP as a Backend enabled

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    package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    elb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := elb.NewElbClient(
        elb.ElbClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.CountPreoccupyIpNumRequest{}
	response, err := client.CountPreoccupyIpNum(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

  • Querying the number of reserved IP addresses required for adding the first HTTP or HTTPS listener to a dedicated load balancer

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    package main

import (
	"fmt"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/core/auth/basic"
    elb "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3"
	"github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/model"
    region "github.com/huaweicloud/huaweicloud-sdk-go-v3/services/elb/v3/region"
)

func main() {
    // The AK and SK used for authentication are hard-coded or stored in plaintext, which has great security risks. It is recommended that the AK and SK be stored in ciphertext in configuration files or environment variables and decrypted during use to ensure security.
    // In this example, AK and SK are stored in environment variables for authentication. Before running this example, set environment variables CLOUD_SDK_AK and CLOUD_SDK_SK in the local environment
    ak := os.Getenv("CLOUD_SDK_AK")
    sk := os.Getenv("CLOUD_SDK_SK")
    projectId := "{project_id}"

    auth := basic.NewCredentialsBuilder().
        WithAk(ak).
        WithSk(sk).
        WithProjectId(projectId).
        Build()

    client := elb.NewElbClient(
        elb.ElbClientBuilder().
            WithRegion(region.ValueOf("<YOUR REGION>")).
            WithCredential(auth).
            Build())

    request := &model.CountPreoccupyIpNumRequest{}
	response, err := client.CountPreoccupyIpNum(request)
	if err == nil {
        fmt.Printf("%+v\n", response)
    } else {
        fmt.Println(err)
    }
}

For SDK sample code of more programming languages, see the Sample Code tab in API Explorer. SDK sample code can be automatically generated.

Status Codes

Status Code

Description

200

Successful request.

Error Codes

See Error Codes.

Parent Topic: Reserved IP Address