---
title: "Translate Legacy List Id to Modern List Id in Batch"
method: POST
path: "/crm/v3/lists/idmapping"
tags: ["Basic"]
---

# Translate Legacy List Id to Modern List Id in Batch

`POST /crm/v3/lists/idmapping`

This API allows translation of a batch of legacy list id's to list id's. This allows for a maximum of 10,000 id's. This is a temporary API allowed for mapping old id's to new id's and will expire on May 30th, 2025.

## Request body

- string[]

## Response `200`

successful operation

- PublicBatchMigrationMapping
  - `legacyListIdsToIdsMapping` PublicMigrationMapping[], required
    - `legacyListId` string, required — The legacy list id for the list
    - `listId` string, required — The V3 list id for the list
  - `missingLegacyListIds` string[], required — A list of legacy list ids that were passed in but not found. It will be empty if no id's are missing

## Other responses

- `default` — An error occurred.

---

[API](https://skmtc.net/hubspot/apis/crm-lists.md) · [All operations](https://skmtc.net/hubspot/apis/crm-lists/llms.txt) · [OpenAPI document](https://skmtc-service-staging.skmtc.workers.dev/v1/apis/hubspot/crm-lists/revisions/2ba1203b03a0/schema)