# Australian ABN and ACN Validator (bulk) (`ledgerleaf/aussie-apify-actors`) Actor

Bulk-check Australian ABN and ACN numbers: check digit, tidy formatting and clear reasons. Offline, fast and cheap. Up to 10,000 numbers per run.

- **URL**: https://apify.com/ledgerleaf/aussie-apify-actors.md
- **Developed by:** [Ledgerleaf Data Tools](https://apify.com/ledgerleaf) (community)
- **Stats:** 2 total users, 1 monthly users, 100.0% runs succeeded, 0 bookmarks
- **User rating**: No ratings yet

## Pricing

from $2.00 / 1,000 number checkeds

This Actor is paid per event. You are not charged for the Apify platform usage, but only a fixed price for specific events.

Learn more: https://docs.apify.com/actors/running/actors-in-store.md#pay-per-event

## What's an Apify Actor?

An Actor is a serverless cloud program that runs on the Apify platform. It has two run modes.
In Batch mode, an Actor accepts a well-defined JSON input, performs an action which can take anything from a few seconds to a few hours,
and optionally produces a well-defined JSON output, datasets with results, or files in key-value store.
In Standby mode, an Actor provides a web server which can be used as a website, API, or an MCP server.

Apify vocabulary and the platform model are defined once, in the agent quickstart at https://apify.com/agents.md.

## How to integrate an Actor?

If asked about integration, you help developers integrate Actors into their projects.
You adapt to their stack and deliver integrations that are safe, well-documented, and production-ready.

Do not guess an integration path. Every one of them is in the agent quickstart at https://apify.com/agents.md: the Apify MCP server, Agent Skills with the Apify CLI, the JavaScript and Python clients, the REST API, and the account-free path for an agent with no human to sign in. It also carries the rule on stating cost before the first paid run.

For examples already wired to this Actor's own input schema, see the [API](#api) section below.

Each client library has reference documentation the quickstart does not restate: [JavaScript/TypeScript](https://docs.apify.com/api/client/js/docs.md) (`npm install apify-client`) and [Python](https://docs.apify.com/api/client/python/docs.md) (`pip install apify-client`).

# README

## Australian ABN and ACN Validator (bulk)

Check thousands of Australian Business Numbers (ABN) and Australian Company Numbers (ACN) in seconds. Paste a list, get one clean row per number: valid or not, the tidy `12 345 678 901` format, and a plain reason when a number fails.

It works entirely offline. No login, no proxies, no calls to the ABR or ASIC, so it is fast and cheap.

### What it checks

- **ABN**: the 11 digit check the Australian Business Register publishes (take 1 from the first digit, apply the weights, the total must divide by 89).
- **ACN**: the 9 digit check ASIC publishes (weights 8 to 1, complement of the total modulo 10).
- Length, stray letters, spaces, dashes and dots. `51-824-753-556`, `51 824 753 556` and `51824753556` all work.
- For a valid ABN, it also tells you whether the last 9 digits form a valid ACN (a company ABN ends in its ACN). A few sole trader ABNs pass this test by chance, so treat it as a hint.

**A valid check digit does not prove the business exists.** It only proves the number is well formed. To confirm registration and the current status, look the number up on ABN Lookup (abr.business.gov.au).

### Use it to

- Clean a CRM, mailing or accounting import before it reaches your system.
- Catch typos in supplier, customer and invoice ABN fields.
- Add a cheap "is this number even valid" step to an AI agent or workflow.

### Input

| Field | What it is |
|---|---|
| `numbers` | List of ABNs and ACNs. Up to 10,000 per run. |
| `numberType` | `auto` (default: 11 digits is an ABN, 9 digits is an ACN), `abn` or `acn`. |

```json
{ "numbers": ["51 824 753 556", "004 085 616", "12 345 678 901"], "numberType": "auto" }
```

### Output

One row per input number:

```json
{
  "input": "88000014675",
  "type": "ABN",
  "valid": true,
  "formatted": "88 000 014 675",
  "reason": null,
  "possibleAcn": "000 014 675"
}
```

A row that fails looks like `{"input": "12 345 678 901", "type": "ABN", "valid": false, "formatted": "12 345 678 901", "reason": "check digit does not match", "possibleAcn": null}`.

A `SUMMARY` record in the key-value store gives the totals: how many checked, valid and not valid.

### Pricing

You pay per number checked (pay per event). Runs cost cents. See the pricing panel on this page for the current price.

### FAQ

**Does it use my ABR GUID?** No. It does not call the ABR at all.

**Does it check TFNs?** No, and it never should. Tax file numbers are sensitive personal information.

**Where do the algorithms come from?** The ABN rule is published by the Australian Business Register (abr.business.gov.au, "Validating an ABN"). The ACN rule is in ASIC's Message Implementation Guide for Software Developers, Appendix D.

Not affiliated with or endorsed by the Australian Taxation Office, the Australian Business Register or ASIC.

# Actor input Schema

## `numbers` (type: `array`):

The numbers to check. Spaces, dashes and dots are ignored. An 11 digit number is treated as an ABN and a 9 digit number as an ACN unless you choose a number type below. Up to 10,000 numbers per run.

## `numberType` (type: `string`):

Auto detects by length. Choose ABN or ACN to force one type and get a clear error for numbers of the wrong length.

## Actor input object example

```json
{
  "numbers": [
    "51 824 753 556",
    "004 085 616",
    "12 345 678 901"
  ],
  "numberType": "auto"
}
```

# Actor output Schema

## `results` (type: `string`):

No description

# API

You can run this Actor programmatically using our API. Below are code examples in JavaScript, Python, and CLI, as well as the OpenAPI specification and MCP server setup.

## JavaScript example

```javascript
import { ApifyClient } from 'apify-client';

// Initialize the ApifyClient with your Apify API token
// Replace the '<YOUR_API_TOKEN>' with your token
const client = new ApifyClient({
    token: '<YOUR_API_TOKEN>',
});

// Prepare Actor input
const input = {
    "numbers": [
        "51 824 753 556",
        "004 085 616",
        "12 345 678 901"
    ]
};

// Run the Actor and wait for it to finish
const run = await client.actor("ledgerleaf/aussie-apify-actors").call(input);

// Fetch and print Actor results from the run's dataset (if any)
console.log('Results from dataset');
console.log(`💾 Check your data here: https://console.apify.com/storage/datasets/${run.defaultDatasetId}`);
const { items } = await client.dataset(run.defaultDatasetId).listItems();
items.forEach((item) => {
    console.dir(item);
});

// 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/js/docs

```

## Python example

```python
from apify_client import ApifyClient

# Initialize the ApifyClient with your Apify API token
# Replace '<YOUR_API_TOKEN>' with your token.
client = ApifyClient("<YOUR_API_TOKEN>")

# Prepare the Actor input
run_input = { "numbers": [
        "51 824 753 556",
        "004 085 616",
        "12 345 678 901",
    ] }

# Run the Actor and wait for it to finish
run = client.actor("ledgerleaf/aussie-apify-actors").call(run_input=run_input)

# Fetch and print Actor results from the run's dataset (if there are any)
print(f"💾 Check your data here: https://console.apify.com/storage/datasets/{run.default_dataset_id}")
for item in client.dataset(run.default_dataset_id).iterate_items():
    print(item)

# 📚 Want to learn more 📖? Go to → https://docs.apify.com/api/client/python/docs/quick-start

```

## CLI example

```bash
echo '{
  "numbers": [
    "51 824 753 556",
    "004 085 616",
    "12 345 678 901"
  ]
}' |
apify call ledgerleaf/aussie-apify-actors --silent --output-dataset

```

## MCP server setup

```json
{
    "mcpServers": {
        "apify": {
            "type": "http",
            "url": "https://mcp.apify.com/?tools=fetch-actor-details,ledgerleaf/aussie-apify-actors"
        }
    }
}
```

The hosted server signs you in with OAuth on first connect, so no API token belongs in this config. Clients without OAuth support can send an `Authorization: Bearer <APIFY_API_TOKEN>` header instead, using a token from API & Integrations in Apify Console (https://console.apify.com/settings/integrations).

## OpenAPI specification

Download the OpenAPI definition: https://api.apify.com/v2/actors/Sf1TiTf3528ZJRA41/builds/Q3vCJCb4kd54SNXal/openapi.json