> ## Documentation Index
> Fetch the complete documentation index at: https://developers.hubspot.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

---
id: 7d32347e-6cff-4677-903c-5f7e8f0244e8
---

# Retrieve ID Mapping

> Retrieve the mapping of legacy list IDs to their current IDs in the HubSpot system. This endpoint is useful for migrating or updating systems that rely on legacy list identifiers.

export const ScopesList = ({scopes = [], description = "This API requires one of the following scopes:"}) => {
  if (!scopes || scopes.length === 0) {
    return null;
  }
  const sortedScopes = scopes.sort((a, b) => a.localeCompare(b));
  return <div>
      <div className="text-sm mb-2">{description}</div>
      <div>
        {sortedScopes.map((scope, index) => <div key={index}>
            <code>
              <span className="text-xs">{scope}</span>
            </code>
          </div>)}
      </div>
    </div>;
};

export const SupportedProducts = ({marketing, sales, service, cms, data, commerce, crm, marketingLevel, salesLevel, serviceLevel, cmsLevel, dataLevel, commerceLevel, crmLevel}) => {
  const translations = {
    description: "Requires one of the following products or higher.",
    productNames: {
      marketing: "Marketing Hub",
      sales: "Sales Hub",
      service: "Service Hub",
      cms: "Content Hub",
      data: "Data Hub",
      commerce: "Revenue Hub",
      crm: "Smart CRM"
    },
    tiers: {
      free: "Free",
      starter: "Starter",
      professional: "Professional",
      enterprise: "Enterprise"
    }
  };
  const translateTier = tier => {
    if (!tier) return '';
    const lowerTier = tier.toLowerCase();
    return translations.tiers[lowerTier] || tier;
  };
  const products = [{
    name: marketing ? translations.productNames.marketing : '',
    level: translateTier(marketingLevel),
    icon: "https://mintlify-assets.b-cdn.net/Icons/marketing-bolt.svg",
    alt: "Marketing Hub"
  }, {
    name: sales ? translations.productNames.sales : '',
    level: translateTier(salesLevel),
    icon: "https://mintlify-assets.b-cdn.net/Icons/sales-star.svg",
    alt: "Sales Hub"
  }, {
    name: service ? translations.productNames.service : '',
    level: translateTier(serviceLevel),
    icon: "https://mintlify-assets.b-cdn.net/Icons/service-heart.svg",
    alt: "Service Hub"
  }, {
    name: cms ? translations.productNames.cms : '',
    level: translateTier(cmsLevel),
    icon: "https://mintlify-assets.b-cdn.net/Icons/content-play.svg",
    alt: "Content Hub"
  }, {
    name: data ? translations.productNames.data : '',
    level: translateTier(dataLevel),
    icon: "https://developers.hubspot.com/hubfs/Knowledge_Base_2023-24-25/subscription_key_icons/operations_icon.svg",
    alt: "Data Hub"
  }, {
    name: commerce ? translations.productNames.commerce : '',
    level: translateTier(commerceLevel),
    icon: "https://developers.hubspot.com/hubfs/Knowledge_Base/subscription_key_icons/commerce_icon.svg",
    alt: "Revenue Hub"
  }, {
    name: crm ? translations.productNames.crm : '',
    level: translateTier(crmLevel),
    icon: "https://developer.hubspot.com/hubfs/Knowledge_Base_2023-24-25/developer/icons/SmartCRM.svg",
    alt: "Smart CRM"
  }].filter(product => product.name && product.level);
  if (products.length === 0) return null;
  return <div>
      <div className="text-sm mb-2">{translations.description}</div>
      <div className={`grid ${products.length === 1 ? 'grid-cols-1' : 'grid-cols-2'} gap-1.5`}>
        {products.map((product, index) => <div key={index} style={{
    display: 'flex',
    alignItems: 'center'
  }}>
            <img src={product.icon} alt={product.alt} className="w-3.5 h-3.5 mr-1.5 mt-2.5 mb-2.5 flex-shrink-0 align-middle" />
            <span className="font-medium mr-1 text-sm">{product.name} -</span>
            <span className="text-sm">{product.level}</span>
          </div>)}
      </div>
    </div>;
};

<AccordionGroup>
  <Accordion title="Supported products" defaultOpen="true" icon="cubes">
    <SupportedProducts marketing={true} sales={true} service={true} cms={true} marketingLevel="FREE" salesLevel="FREE" serviceLevel="FREE" cmsLevel="FREE" />
  </Accordion>

  <Accordion title="Required Scopes" icon="key">
    <ScopesList
      scopes={[
  'crm.lists.read'
]}
    />
  </Accordion>
</AccordionGroup>


## OpenAPI

````yaml specs/2026-09-beta/crm-lists-v2026-09-beta.json GET /crm/lists/2026-09-beta/idmapping
openapi: 3.0.1
info:
  title: CRM Lists
  description: Basepom for all HubSpot Projects
  version: 2026-09-beta
  x-hubspot-product-tier-requirements:
    marketing: FREE
    sales: FREE
    service: FREE
    cms: FREE
    commerce: FREE
    crmHub: FREE
    dataHub: FREE
servers:
  - url: https://api.hubapi.com
security: []
tags:
  - name: Basic
  - name: Batch
  - name: Search
paths:
  /crm/lists/2026-09-beta/idmapping:
    get:
      tags:
        - Basic
      summary: Retrieve ID Mapping
      description: >-
        Retrieve the mapping of legacy list IDs to their current IDs in the
        HubSpot system. This endpoint is useful for migrating or updating
        systems that rely on legacy list identifiers.
      operationId: get-/crm/lists/2026-09-beta/idmapping
      parameters:
        - name: legacyListId
          in: query
          description: >-
            The legacy list ID for which you want to retrieve the current ID
            mapping.
          required: false
          style: form
          explode: true
          schema:
            type: string
      responses:
        '200':
          description: successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/PublicMigrationMapping'
        default:
          $ref: '#/components/responses/Error'
          description: ''
      security:
        - oauth2:
            - crm.lists.read
components:
  schemas:
    PublicMigrationMapping:
      required:
        - legacyListId
        - listId
      type: object
      properties:
        legacyListId:
          type: string
          description: >-
            The legacy list ID from the previous system. This is a string that
            represents the list ID in the legacy system.
        listId:
          type: string
          description: >-
            The new list ID in the HubSpot system. This is a string that
            uniquely identifies the list in the current system.
    Error:
      required:
        - category
        - correlationId
        - message
      type: object
      properties:
        category:
          type: string
          description: A string indicating the category of the error.
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: >-
            An object containing additional context about the error, represented
            as a map of key-value pairs.
          example: >-
            {invalidPropertyName=[propertyValue], missingScopes=[scope1,
            scope2]}
        correlationId:
          type: string
          description: >-
            A unique identifier for the error instance, used for tracking and
            debugging purposes.
          format: uuid
          example: aeb5f871-7f07-4993-9211-075dc63e7cbf
        errors:
          type: array
          description: >-
            An array of ErrorDetail objects, each providing additional
            information about specific errors that occurred.
          items:
            $ref: '#/components/schemas/ErrorDetail'
        links:
          type: object
          additionalProperties:
            type: string
          description: >-
            An object containing related links, represented as a map of link
            names to URLs.
        message:
          type: string
          description: A string that provides a human-readable description of the error.
          example: An error occurred
        subCategory:
          type: string
          description: >-
            An object representing a more specific classification of the error
            within its category.
      example:
        message: Invalid input (details will vary based on the error)
        correlationId: aeb5f871-7f07-4993-9211-075dc63e7cbf
        category: VALIDATION_ERROR
        links:
          knowledge-base: https://www.hubspot.com/products/service/knowledge-base
    ErrorDetail:
      required:
        - message
      type: object
      properties:
        code:
          type: string
          description: >-
            A string representing a specific error code that identifies the type
            of error.
        context:
          type: object
          additionalProperties:
            type: array
            items:
              type: string
          description: >-
            An object containing additional context about the error, represented
            as a map of strings to arrays of strings, which can include specific
            parameters or values related to the error.
          example: '{missingScopes=[scope1, scope2]}'
        in:
          type: string
          description: >-
            A string indicating the location where the error occurred, such as
            'query', 'header', or 'body'.
        message:
          type: string
          description: A string containing a human-readable description of the error.
        subCategory:
          type: string
          description: >-
            An object providing additional categorization of the error, which
            may contain further details.
  responses:
    Error:
      description: An error occurred.
      content:
        '*/*':
          schema:
            $ref: '#/components/schemas/Error'
  securitySchemes:
    oauth2:
      type: oauth2
      flows:
        authorizationCode:
          authorizationUrl: https://app.hubspot.com/oauth/authorize
          tokenUrl: https://api.hubapi.com/oauth/v1/token
          scopes:
            cms.membership.access_groups.write: ''
            crm.lists.read: ''
            crm.lists.write: ''

````