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DUNS Number Generator

DUNS Number Generator

Generate 9-digit Dun & Bradstreet-shaped mock DUNS numbers (XX-XXX-XXXX) for corporate test fixtures

For Development & Testing Purposes Only - Synthetic Mock Data

Privacy Notice: This tool runs entirely in your browser. Nothing you generate or enter is sent to any server or stored anywhere.

Generate one checksum-valid mock value. Open Bulk for up to 500 records.

About this tool

DUNS Number Generator produces structurally valid synthetic identifiers for software testing. Checksums follow the published standard so validators and import pipelines can be exercised without live records.

Values are randomized in the browser and do not correspond to real accounts, devices, vehicles, securities or legal entities. Using them outside development or QA is prohibited.

How to use

  1. Configure the generator

    Select the country, format or vendor options that match your fixture.

  2. Generate mock values

    Choose a batch size up to 500 and generate checksum-valid test data.

  3. Export for seeding

    Copy a single value or download JSON, CSV, SQL or language arrays.

Use cases

QA automation

Feed structurally valid IDs into Cypress, Playwright or API contract tests.

Database seeding

Populate staging tables with mock IBANs, tracking numbers or device IDs.

Common mistakes

Mistake:Using a generated value in a live financial, customs or identity system.

Fix:Keep output in development and QA only. The synthetic-mock-data banner is permanent for a reason.

Mistake:Assuming a passing checksum means the record exists.

Fix:Checksums only prove format. These identifiers are deliberately unbound to real entities.

Frequently asked questions

References & standards

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