Free online tool
ACN Validator.
Validate Australian Company Numbers (ACN) using the official ASIC check-digit algorithm.
ASIC Format Check
An ACN is a 9-digit number issued by ASIC to every company registered in Australia.
Three simple steps
How to use ACN Validator
1
Enter ACN
Type or paste a 9-digit ACN.
2
Validate
Run the ASIC check-digit calculation.
3
Review result
See valid/invalid status and formatted ACN.
Helpful answers
Frequently asked questions
What is the difference between an ACN and an ABN?
An ACN is a 9-digit identifier for a company registered under the Corporations Act. An ABN is an 11-digit identifier for any entity carrying on an enterprise; a company's ABN is usually its ACN with a two-digit prefix.
Why does my ACN fail the check?
Usually a transcription error — a swapped or missing digit. Re-enter it exactly as it appears on the certificate of registration or an ASIC document.