What it means
DUNS stands for Data Universal Numbering System. Dun & Bradstreet assigns each business record a number so that companies with similar names, or the same company in different places, can be told apart.
The number stays with the business even if its name or address changes. The number links to a business credit file maintained by Dun & Bradstreet.
That file can include trading history, payment behaviour, company size and ownership structure. Suppliers often check it before offering credit terms, and banks may look at it when assessing a loan.
Many organisations require a DUNS number as part of doing business with them. Large buyers use it to onboard suppliers, some government grant and contract processes ask for it, and certain app marketplaces and platforms request it to confirm a company is real.
Applying for one is generally free of charge through Dun & Bradstreet, although the process can take some days. A single company can have more than one DUNS number.
A head office, a branch and a separate subsidiary may each hold their own, and they are linked in a family tree that shows which entity owns which. This helps lenders see the whole group when judging exposure.
A DUNS number is an identifier, not a score. Having one does not mean a company has good credit, and the number itself says nothing about financial strength.
The business credit scores and ratings are separate products built from the data held on the file. For a growing company, the number also helps with the practical side of building a credit history.
Because suppliers report payment experience against the number, paying invoices on time can gradually improve the file and make it easier to negotiate better terms. Finance teams often review the report once or twice a year to check that nothing is wrong or out of date.
In practice
Real-world examples.
Example
A new furniture importer applies for trade credit from a large wholesaler. The wholesaler's accounts team asks for the importer's DUNS number so it can pull a credit report before approving a $25,000 limit. Because the importer is new, the wholesaler starts with a lower limit and promises a review after six months of prompt payment.
Example
A software start-up wants to list its app in a marketplace for business customers. The platform asks for a DUNS number to confirm that the company is a registered legal entity. The founder enters the number during sign-up, and the platform matches it against the company's name and address.
Example
A construction firm bids for a public contract worth $1,500,000. The tender portal requires the firm's DUNS number so it can match the firm to its registration records. If the details on the bid do not match the details held under the number, the submission may be delayed or rejected.
Case study
Seen in the real world.
Kestrel Bakery Supplies is a fictional family business that wanted to sell to a national supermarket chain. The chain's procurement team asked for a DUNS number during supplier onboarding, and the bakery realised it had never registered one.
The owner applied online and received the number within a few days. She then checked the business profile and found the address was outdated and the main contact was a former employee. After correcting the details, the file reflected the real company, and the supermarket approved Kestrel as a supplier. The owner now reviews the profile every six months so that future buyers see accurate information. She also asked her bank and two key suppliers to confirm that they report payment history against the correct number.
This illustrative story shows that getting the number is only part of the job. Keeping the profile accurate matters because buyers, lenders and credit agencies rely on it when they decide whether to trust a business.
Watch out
Common mistakes.
- Thinking a DUNS number is a credit score, when it is only an identifier that links to a credit file. The score is a separate rating that is built from the information held in that file.
- Never checking the information held under the number, so errors in the address, ownership or contacts mislead buyers and lenders. A wrong trading name can even cause a payment to be matched to the wrong company.
- Assuming a single number covers every entity in a group, when branches and subsidiaries can each have their own.
Questions
People also ask.
Do I have to pay for a DUNS number?
A basic number is generally free to request, although Dun & Bradstreet sells additional reports and monitoring services.
How long is a DUNS number?
It is nine digits long, and it contains no hidden meaning, so it cannot be worked out from the company name or location.
Does the number change if my company moves?
No, the number stays with the business, and you simply update the address in the record. A change of ownership or legal form can sometimes lead to a new record, so ask Dun & Bradstreet if you are unsure.
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