ABN checker

Type an ABN, an ACN or a company name. The number is checked in your browser first (the ABN check digit, weighted sum divisible by 89), then the company is read from ASIC and the Australian Business Register.

What the check does

An ABN is 11 digits. The test: subtract 1 from the first digit, multiply the digits by 10, 1, 3, 5, 7, 9, 11, 13, 15, 17 and 19, add the products, and the total must divide by 89. A pass says the number is well-formed. It does not say the business exists, is current or is registered for GST, which is why the tool then looks for a company that holds the ABN.

What comes back

The registered company behind the ABN: its name, type (proprietary, public or foreign company), status, the state and the postcode of the registered office, and the GST number where the ABN is active and registered for GST. The Australian record is the registered company: proprietary, public and foreign companies with an ACN or an ARBN, joined to the Australian Business Register (ABR) by that number. It gives the state and the postcode of the registered office, not a street address. Associations, cooperatives, other registered bodies, trusts, partnerships, individuals and sole traders are never served, and it does not replace ABN Lookup for the ABN and GST history of a business.

Reading the result

  • Fails the check: a typo or an invalid number; nothing is sent to the register.
  • Passes, no company: the ABN may belong to a sole trader, trust, partnership or association. Look it up on ABN Lookup.
  • Company, no GST number: the company was not on the GST list at the last weekly read.
  • Status strike-off pending, in administration or deregistered: the register is telling you the company is on its way out or gone.

The same call is GET /companies/search?country=AU&abn=49004028077 with an API key; see the ABN Lookup API guide for batch lookup and monitoring.

Australia is included in every plan at no upcharge. The 14-day free trial includes 500 credits, needs a card and charges nothing; Starter (EUR 9.99 a month, 1,000 credits) follows unless you cancel. A company record costs 1 credit; an error response costs nothing. See pricing for the plans.

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Contains data from the Australian Securities and Investments Commission (ASIC) Company Dataset and the Australian Business Register (ABN Bulk Extract), licensed CC BY 3.0 AU (creativecommons.org/licenses/by/3.0/au/). Adapted by Prometiam (joined, normalised, status derived).

Frequently asked questions

Is this the official ABN Lookup?
No. ABN Lookup is run by the Australian Business Register. This tool reads ASIC and ABR open data through the Prometiam API and is a convenience, not an official extract.
Why does a valid ABN show no company?
Only registered companies are served. A sole trader, a trust, a partnership or an association with a valid ABN returns nothing.
Why is there no street address?
The register data carries the state and the postcode of the registered office only.
Is it free?
Yes, with a shared demo key and a daily limit. A personal key from the free trial removes the limit.