D-U-N-S Number checker

Client

Vendor onboarding and government forms often list D-U-N-S Numbers beside LEI or tax identifiers. This page strips hyphens, confirms the nine-digit layout, and recomputes the published modulus‑10 check digit—pair with LEI checksum when the same counterparty row also has a Legal Entity Identifier.

About 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. The interactive transform on this page runs in your browser tab—Toolcore does not need your paste for the core operation described above.

How to use this page

Paste or type in the main workspace, run the primary action from the toolbar, then copy or download the result. Use Load example when the page offers it, or URL prefill (?q= / ?qb=) so agents and tickets open the same input.

Privacy:checksum math runs locally in your tab. Toolcore does not query Dun & Bradstreet or business registries—format and check digit only.
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A D-U-N-S Number is 9 digits: eight data digits plus a modulus‑10 check digit with alternating weights 2,1,2,1 from the left. Hyphens in xx-xxx-xxxx grouping are stripped before validation.

Result

Vendor onboarding often lists D-U-N-S beside LEI—open LEI checksum when the same counterparty row also has a Legal Entity Identifier.

Passes D-U-N-S modulus‑10 check for 060704780.

Body (8)
06070478
Check digit
0

Nearby workflows on Toolcore

  • LEI checksum — Twenty-character Legal Entity Identifier—ISO 17442 MOD-97-10 check digits; no GLEIF lookup; browser-only. when headers, identifiers, or reference tables need a sibling check.
  • IBAN validate & format — MOD-97-10 checksum, country length (embedded list), compact or grouped copy—no bank lookup; browser-only. when headers, identifiers, or reference tables need a sibling check.
  • ISIN validate — ISO 6166 securities ID—12 characters, letter expansion + Luhn check digit; no issuer lookup; browser-only. when headers, identifiers, or reference tables need a sibling check.
  • BIC / SWIFT validate — ISO 9362 layout (8 or 11 characters)—bank, country, location, branch segments; no directory lookup; browser-only. when headers, identifiers, or reference tables need a sibling check.

Common use cases

  • Sanity-check a D-U-N-S copied from a supplier questionnaire before loading it into a procurement system.
  • Explain why a nine-digit DUNS fails mod‑10 while a related LEI on the same row still passes MOD‑97‑10.
  • Spot transposed digits in xx-xxx-xxxx grouping when only the DUNS column is available in legacy CSV feeds.
  • Contrast DUNS alternating 2,1 weights with standard Luhn on payment cards when finance teams mix identifiers.

Common mistakes to avoid

  • Treating a passing check as proof of business registration or creditworthiness

    Checksum validation confirms arithmetic only—not legal existence, sanctions status, or D&B credit scores.

  • Applying ISO Luhn (right-to-left doubling) to DUNS

    D-U-N-S uses alternating weights 2,1,2,1 from the left on the first eight digits, summing digits of products above nine.

  • Expecting Dun & Bradstreet company profiles

    Legal name, address, and hierarchy require D&B or licensed feeds—this page performs local format math only.

FAQ

Does Toolcore query Dun & Bradstreet?

No—the check digit and layout rules run entirely in your browser tab.

How is the D-U-N-S check digit calculated?

Multiply the first eight digits alternately by 2 and 1 from the left, sum digits of each product, then set the ninth digit so the total is divisible by 10.

Is D-U-N-S the same as a tax ID or LEI?

No—DUNS is a Dun & Bradstreet business identifier; tax IDs and LEI follow different formats and checksum rules.

Common search terms

Phrases people search for that match this tool. See the full long-tail keyword index.

  • duns number validator online
  • d-u-n-s check digit calculator browser
  • dun and bradstreet number checksum locally
  • validate duns mod 10 no directory lookup
  • nine digit duns format check free

More tools

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