ABN format check

Client

Australian ABN checksum—pairs with ACN searches.

About ABN format check

Validate Australian Business Number with mod-89 check. Processing runs in your browser—Toolcore does not need your paste for the core operation on this page.

Format and checksum rules only—no live registry, carrier, or customs lookup from this page.

How to use

Paste or type in the main field, then read the output below. Use Load example when available, or open the page with ?q= / ?qb= so tickets and agents share the same input.

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Nearby workflows on Toolcore

  • EU VAT number format — Coarse EU VAT ID prefix and length validation. Useful when the same row uses a different identifier ruleset.
  • D-U-N-S Number checker — Nine-digit Dun & Bradstreet identifier—modulus‑10 check digit on eight data digits; no D&B lookup; browser-only. Useful when the same row uses a different identifier ruleset.
  • LEI checksum — Twenty-character Legal Entity Identifier—ISO 17442 MOD-97-10 check digits; no GLEIF lookup; browser-only. Useful when the same row uses a different identifier ruleset.
  • Luhn checksum (mod 10) — Paste a digit string (spaces ignored)—pass or fail Luhn for PANs, IMEI-style IDs, and test vectors; browser-only. Useful when the same row uses a different identifier ruleset.

Common use cases

  • ABN format check for quick local checks without uploading data.
  • Copy results into tickets, docs, or classroom notes.

Common mistakes to avoid

  • Unexpected input shape

    See the intro and how-to notes for accepted formats.

FAQ

Is processing local?

Yes—this runs entirely in your browser.

Agent prefill?

Use q or qb for the main text field when supported.

More tools

Related utilities you can open in another tab—mostly client-side.