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A DUNS number (Data Universal Numbering System) is a globally unique nine-digit identifier assigned to businesses by Dun & Bradstreet (D&B), the global commercial data and credit-reporting agency. In use since 1963, it lets a company be recognised across the world’s business registry. For UK (United Kingdom) based businesses, a DUNS number is a trust and transparency tool used everywhere from supplier onboarding to credit applications.
In this guide we explain what a UK DUNS number is, what it is used for, how it is assigned automatically in the UK, how to look it up, and its costs — based on current official sources.
A DUNS number acts as a permanent identifier for your company’s business credit file maintained by Dun & Bradstreet. This file holds the company’s name, address, contact details, corporate linkage to headquarters and branches, and the scores and ratings that assess its financial health. D&B calls this profile the “Live Business Identity”.
Using the DUNS number, potential partners can request a business credit report about your company; likewise, you can access the same information about firms you are considering working with. The number therefore serves as a key that lets each party verify the other’s stability, creditworthiness and reliability.
For a business operating in the UK, a DUNS number comes into play in several scenarios:
According to Dun & Bradstreet’s official statement, although a DUNS number is no longer mandatory for U.S. federal government contracts, it is still widely used by many agencies, governments and companies around the world.
A DUNS number is not legally required; there is no statutory obligation for businesses to obtain one. However, it offers a strong advantage in the following situations:
There is an important convenience for the UK: all registered businesses in the UK and Ireland are automatically issued a DUNS number at no charge. In other words, once you register your company at Companies House, your number is created without needing a separate application.
If your company is established outside the UK or Ireland, the online application typically follows these steps:
The table below summarises the process and costs of obtaining a DUNS number based on official Dun & Bradstreet data:
| Service Type | Processing Time | Cost |
|---|---|---|
| UK / Ireland (Automatic) | Automatic after registration | Free |
| Standard application (other countries) | Up to 30 business days | Free |
| Expedited | Within 8 business days | Fee varies by country |
To find your company’s DUNS number or verify a partner’s, you can use Dun & Bradstreet’s official D-U-N-S Lookup tool:
If your business is not in the database, it can take a few weeks for a number to be assigned and added.
| Benefit | Value to Your Business |
|---|---|
| International recognition | Makes your company visible and verifiable in the global D&B database. |
| Business credit | Builds your credit reputation through the Live Business Identity file. |
| Supplier & tender access | Lets you qualify in supplier applications of large firms and public bodies. |
| Faster approval | Speeds up the credit approval process with some financial institutions. |
For professional support with UK company formation and all corporate identity processes including the DUNS number, see our UK company formation guide, and for tax identity, read our article on the UK tax number (TIN) system. For any questions, get in touch with us.
From company formation to the DUNS number and tax identity, World Company Setup’s expert team supports you at every corporate step in the United Kingdom. Get ahead in international trade with the right corporate identity structure.
Yes. All businesses registered in the UK and Ireland are assigned a DUNS number free of charge and automatically. The standard application is also free; only the optional expedited service carries a fee that varies by country.
For UK/Ireland-based companies it is created automatically after registration. In other countries, the standard application can take up to 30 business days; the expedited (paid) service reduces this to within 8 business days.
Use Dun & Bradstreet’s official “D-U-N-S Lookup” tool and search your company name and location. If your business is in the database, it appears under the “DUNS Number” field in the profile.
No, there is no legal obligation. However, it offers a strong advantage as it is frequently requested for credit, tenders, grant applications and the supplier onboarding processes of large companies.
It acts as a unique identifier for your company’s global business credit file, letting partners verify your creditworthiness and reliability and helping you be recognised in international trade.
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