Free tool

DUNS Number Search

Type a D-U-N-S number and the check reports whether it is nine digits. There is no public check digit, so the check reads the shape only and cannot tell you whether the number was issued. Dun and Bradstreet issues D-U-N-S numbers and is the place to confirm one.

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Nine digits, no letters.

The result appears here. Nothing is stored, and the allowance is per visitor per day.

Example result

Nine digits in the right shape

D-U-N-S number
123456789
Format
Nine digits
Check digit test
None published
Verdict
Well formed

This is a format example, not a real number. Dun and Bradstreet publishes no check digit, so the check cannot confirm the number exists.

A real check above replaces this example.

What the check reads

Nine digits
The count runs after spaces and hyphens are stripped, so 123 456 789 and 123-456-789 are the same input.
No check digit
A D-U-N-S number has no public check digit, so the check cannot test one. This is why the result confirms the shape only and does not call the number valid.
Letters rejected
The number is digits only. A string with a letter in it fails, because a D-U-N-S number contains none.
Length, not value
Any nine digits pass. The check has no way to tell a real number from a random one, and it does not try.
What this does not check
Whether the number was issued, which business holds it, and whether that business still trades. Dun and Bradstreet holds all of that.

Where the answer comes from

Worked examples

Example inputs and the results they return.

123456789

Nine digits in the right shape

D-U-N-S number
123456789
Format
Nine digits
Check digit test
None published
Verdict
Well formed

This is a format example, not a real number. Dun and Bradstreet publishes no check digit, so the check cannot confirm the number exists.

123 456 789

Spaces and hyphens are ignored

Digits
9
Separators
Ignored
Verdict
Well formed

The number is often written in groups, so the check strips the separators before it counts.

12345678

One digit short

Digits
8
Needed
9
Verdict
Not a D-U-N-S number

A dropped digit is the commonest mistake, and there is no check digit to catch it.

FAQ

Common questions

Does this find the company behind a D-U-N-S number?
No, and no public source we can read does. A D-U-N-S number is issued and held by Dun and Bradstreet and is not published against a company in any open register. Dun and Bradstreet's own lookup is the place to confirm a number.
Does a valid nine-digit number prove the D-U-N-S exists?
No. A valid format means the input is nine digits, nothing more. The check cannot tell an issued number from a random one, so it never claims a number is valid.
Why is there no check digit?
Dun and Bradstreet does not publish the arithmetic behind a D-U-N-S number, so no honest check can recompute one. The check reads the shape and says so.
What is a D-U-N-S number used for?
It is a nine-digit identifier for a business, used in credit reports, supplier onboarding and procurement. It is not a government number and is not tied to a register.
Is a D-U-N-S number the same as an EIN?
No. An EIN is the tax-side number the US tax authority issues. A D-U-N-S number is issued by Dun and Bradstreet for business identification. The two look alike but have no relation, and each has its own check on this site.
Is the check free?
Yes. It is free and needs no account. The nine-digit rule runs in your browser, so retrying a mistyped number costs nothing, and each well-formed D-U-N-S number you check uses one of the tool's 5 daily checks.

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