What is ABN Signal?
ABN Signal monitors publicly available Australian Business Number records and explains what they contain. The site is independent - it is not part of any government registry or official register.
Each week, the dataset refreshes from public sources. The new snapshot is compared against the previous one, and any differences in record fields are flagged as detected changes.
What you can find here
- Record explanations. Each ABN record contains fields like status, entity type, GST registration, and business names. ABN Signal explains what these fields mean and how to read them.
- Weekly change detection. The site surfaces differences between weekly data snapshots - changes in ABN status, GST status, entity names, and other record fields. A detected change means the two snapshots differ, not that the source updated at that exact moment.
- Guides and reference pages. Glossary entries define ABN terminology in plain language. Guides walk through common questions like how to check whether an ABN is active or what a status change means.
How the weekly refresh works
The dataset refreshes once per week. Changes are not tracked in real time.
A detected change on this site reflects a difference between two consecutive weekly snapshots. For example, if an ABN's GST status moves from Active to Cancelled between snapshots, the site records that as a detected change. The actual source-level update may have occurred at any point during the prior week.
Every page that references detected changes should be read with this weekly cadence in mind.