The Australian Business Number (ABN) is a unique 11 digit identifier issued to all entities registered in the Australian Business Register (ABR). It is used when dealing with government agencies (including the Australian Taxation Office) and other businesses.
An ABN can have a status of active or cancelled. A status of cancelled means the business has ceased trading. If an entity with an ABN has an associated ACN, ARBN, ARSN or ARFN you can search ABN Lookup using that ACN, ARBN, ARSN or ARFN
See the Australian Business Register website. for more information about ABNs.
Access the Australian Business Register's ABN Lookup.
Example:
63 384 330 717 (AFSA's ABN)