ABN Checker
Check whether an Australian Business Number has a valid format and check digits.
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How to do it
- 1Add the text
Paste or type the text or amount here.
- 2See the result
The result appears right away as you type.
- 3Copy it
Copy the result and use it anywhere. Your text goes nowhere.
About this tool
Type an ABN with or without spaces. The tool applies the official check-digit rule: subtract 1 from the first digit, multiply each digit by its weight and test that the sum divides by 89. It checks the number format only, not whether the business exists. Use the ABN Lookup site to confirm a business.
Frequently asked questions
Does a valid result mean the business exists?
No. It only means the number is correctly formed. Confirm it on the ABN Lookup website.
How long is an ABN?
11 digits, usually written as 2, 3, 3 and 3 digits.