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Australian ACN Format & Checksum Checker

Check nine-digit Australian company numbers for typing errors while preserving leading zeroes.

Tool inputs stay in your browser · optional AI search sends your query

Good to know: Checks the ASIC weighted modulus-10 checksum locally. An ACN is different from an 11-digit ABN. A pass does not confirm registration, current status, company ownership or trustworthiness. The all-zero placeholder is rejected. Rules reviewed November 11, 2026.

How to use it (step by step)

  1. 1Copy the nine-digit ACN, including leading zeroes. Spaces are allowed.
  2. 2Read the checksum result and grouped print format. A passing checksum is only a typing-error check.
  3. 3Search ASIC separately to confirm the company and status before using its details.

Words to know

ACN
A nine-digit Australian Company Number issued by ASIC.
Check digit
The last digit, calculated from the previous eight digits to catch many typing errors.

Explore tools for Australia, the US & Europe →

Sources & methods

References checked November 11, 2026. Read each tool’s scope and assumptions before relying on its result.

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