Australian Business
Australian ABN Checker Online
An Australian Business Number is an 11-digit identifier with a built-in checksum. This checker validates the format and checksum, which helps catch typos before you use an ABN in an invoice or contract.
Official Standards & Rule Matrix
Format11 digits with the official weighting
ChecksumValidates the number, not the business name
Use caseInvoice, supplier and contract checks
ScopeFormat check only; confirm status on ABN Lookup
How to use this tool
- Enter the 11-digit ABN.
- Review whether the checksum is valid.
- Confirm the business name and status on the official ABN Lookup.
- Keep a record of the check for your supplier file.
Computed completely in your browser. No personal data or numbers are transmitted over the network.
Frequently Asked Questions
- Does a valid ABN mean the business is active?
- No. The checksum only validates the number. You must check the official ABN Lookup for the entity name, status and GST registration.
- Can I check an ABN without the business name?
- Yes. The checksum works on the number alone. To confirm the entity, search the number on ABN Lookup.
- Is this an official government service?
- No. It is an independent format checker. Use the Australian Business Register for official records.
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