What is a DUNS Number? Do I need one in the UK?

Quick answer: A DUNS number (Data Universal Numbering System) is a unique nine-digit identifier assigned to businesses by Dun & Bradstreet. In the UK, most registered businesses are automatically assigned a DUNS number by Dun & Bradstreet; no application is needed. It's used globally for credit checks, government contracts, and verifying business legitimacy.

Key Takeaways

Here's something that surprises a lot of UK business owners: your company may already have DUNS number and you probably never knew.

Every registered business in the UK is assigned one by Dun & Bradstreet (D&B). The number is sitting there right now, attached to a credit file that potential lenders, suppliers, and government procurement teams can access. The question isn't whether you have one. The question is whether you know what's in it and whether you're using it to your advantage.

The DUNS number, short for Data Universal Numbering System, has been around since 1963. It's recognised by the European Commission, the United Nations, Apple, Google, and over 50 global industry associations (according to Wikipedia). More than 500 million businesses worldwide have got one, according to Dun & Bradstreet.

This guide covers everything you need to know: what a DUNS number actually is, whether your company has one, how to find it, and what to do if you can't.

What is a DUNS Number in the UK?

A DUNS number (also written as D-U-N-S number or DNB number) is a unique nine-digit code assigned to each business by Dun & Bradstreet, a global commercial data and analytics company founded in 1841. The data universal numbering system was introduced in 1963 specifically to support D&B's credit reporting practice, and it's now used as the global standard for business identification.

Think of it as a business passport. Just like a passport identifies you across borders, your DUNS number identifies your company across countries, databases, and financial systems worldwide.

In the UK, each D-U-N-S number is linked to what D&B calls a "Live Business Identity", a continuously updated profile that includes:

• Firmographic data - company name, registered address, phone number, email
• Corporate family relationships - whether you're a parent, subsidiary, or branch
• Financial health indicators - including D&B PAYDEX scores, financial stress scores, payment history, and credit ratings

The DUNS number serves three practical purposes for your business:

1. Other businesses use it to check on you - a supplier or lender considering working with you can pull your D&B credit file using your DUNS number
2. You can use it to check on others - if you subscribe to D&B's services, you can run a DUNS lookup UK search on any company you're considering partnering with
3. You can monitor your own business profile - including your ESG score and credit file, so you understand exactly what others see when they search for you

Do All Companies Have a DUNS Number?

Yes. All legally registered companies in the UK automatically receive a DUNS number from Dun & Bradstreet. You don't need to apply, it's assigned based on your Companies House registration.

Many small business owners are completely unaware this has happened. But the number exists, the credit file is live, and third parties can access it.

Sole traders and general partnerships can also obtain a DUNS number, though the process is slightly different, more on that below.

Is a DUNS Number the Same as a VAT Number?

No. These are three entirely different identifiers, and confusing them is one of the most common mistakes we see.

Put simply: your CRN proves you exist in the UK. Your VAT number registers you for tax with HMRC. Your DUNS number identifies you on the global stage.

Where Do I Find My DUNS Number?

Finding your UK DUNS number takes less than five minutes. Here's exactly how to do a DUNS lookup UK:

• Go to the D&B DUNS Number Lookup tool at dnb.co.uk/duns-number/lookup.html
• Choose to search by company name or Companies House registration number
• Enter your business name or CRN, then add your postcode or town
• Select United Kingdom from the dropdown and click Search Now
• When your company appears, click Select
• Enter your name and email address, then click Submit

Your DUNS number will be emailed to you within minutes.

You can also use the global D-U-N-S lookup tool at dunsnumberlookup.dnb.com if you want to search international businesses or run a DUNS number check on a supplier based outside the UK.

What if My Business Doesn't Appear?

There are two possible reasons your company doesn't show up in the DUNS lookup UK search:

1. The address or phone number in D&B's records no longer matches; this happens if you've moved or changed contact details since the number was assigned
2. Your business genuinely doesn't have a DUNS number yet

In either case, you'll need to request one directly. See below.

How Do You Get a DUNS Number for a Company?

If you can't find your number via the lookup tool, requesting one is straightforward and completely free. Here's how to get a DUNS number in the UK:

• Visit dnb.co.uk/duns-number/lookup/request-a-duns-number.html
• Confirm where your business operates and whether it's registered at Companies House
• Click Request D-U-N-S Number
• Fill in your contact details and your relationship to the business
• Select your industry, number of employees, and legal structure
• Enter your business name, address, trading name (if different), phone number, and website
• Click Submit request

You'll receive a confirmation email with a reference number. A D&B Customer Service Analyst will review the request and respond within five working days.

Important: Be cautious of third-party websites offering to get you a DUNS number for a fee. Applying through Dun & Bradstreet directly is always free. You do not need to pay anyone to complete this process.

How Long Does It Take to Get a DUNS Number?

This depends on how you go about it:

According to Wikipedia's documentation on the Data Universal Numbering System, providing your company registration number can make the assignment of a DUNS number near-immediate for UK businesses - because D&B can verify your details against the Companies House register directly.

TL;DR - DUNS Number UK at a Glance

• A DUNS number is a unique 9-digit code issued by Dun & Bradstreet to identify your business globally
• All UK registered businesses already have one - it was assigned automatically
• It is not the same as your VAT number or your Companies House registration number
• You can find your DUNS number in minutes using the D&B lookup tool at dnb.co.uk
• If it's not there, you can apply for a DUNS number free of charge - it takes up to 5 working days
• It's required for government contracts, international partnerships, loan applications, and platforms like Apple Developer
• Obtaining and managing your DUNS number is entirely free

What Happens If You Ignore Your DUNS Number?

For a small business focused purely on domestic trade, you might never be asked for it. But the moment you bid for a public sector contract, approach a large international supplier, or apply for business finance; it becomes relevant fast.

Potential partners and lenders may be accessing your D&B credit file right now, making decisions about your business based on information you haven't reviewed. That's worth thinking about. Checking your own DUNS number and reviewing your D&B profile takes minutes, and it puts you back in control of how your business is perceived.

How Debitam Can Help

Keeping on top of business admin - from Companies House filings to HMRC compliance - takes real time and attention. At Debitam, we work with small business owners across the UK every day to make sure nothing slips through the cracks.

Whether it's your annual accounts, corporation tax return, or understanding what various business identifiers mean for your compliance obligations, your dedicated Debitam accountant is there to walk you through it. No jargon. No hidden fees. Just reliable support from people who've dealt with HMRC and Companies House more times than we can count.

Get in touch with Debitam today and take business admin off your plate for good.

Frequently Asked Questions

What is a DUNS number in the UK?

A DUNS number (Data Universal Numbering System) is a unique nine-digit identifier assigned to UK businesses by Dun & Bradstreet. It's linked to your business's credit profile and used globally for identity verification, credit checks, government procurement, and international trade. All registered UK businesses are automatically assigned one.

Where can I find my DUNS number UK?

Use the official D&B DUNS number lookup tool at dnb.co.uk/duns-number/lookup.html. Search by company name or your Companies House registration number, enter your postcode and country, and your DUNS number will be emailed to you within minutes. This tool is free to use.

Is a DUNS number the same as a VAT number?

No. A DUNS number is issued by Dun & Bradstreet for global business identification. HMRC issues a VAT number for UK tax purposes. A Company Registration Number (CRN) is issued by Companies House to verify a company's legal existence. These are three completely separate identifiers with different purposes.

Do all UK companies have a DUNS number?

Yes. All legally registered businesses in the UK are automatically issued a DUNS number by Dun & Bradstreet. Many small business owners don't know they have one. You can find yours using the D&B lookup tool - no application required for most UK limited companies.

How do I get a DUNS number for my UK business?

If your DUNS number doesn't appear in the lookup tool, you can request one free of charge at dnb.co.uk/duns-number/lookup/request-a-duns-number.html. You'll need your company name, address, legal structure, number of employees, and contact details. D&B will respond within five working days.

How long does it take to get a DUNS number?

If your business is already in the D&B database, retrieving your DUNS number via the online lookup takes minutes. If you need to request a new one, the process takes up to five working days. UK limited companies that provide their Companies House registration number may receive their number more quickly, as D&B can verify details directly against the Companies House register.

Do I need a DUNS number to apply for a government contract in the UK?

Yes. The UK government's Crown Commercial Service requires suppliers to provide a DUNS number as part of the supplier registration process. If you plan to bid for public sector contracts, having your DUNS number ready - and your D&B profile up to date - is essential.

Is there any cost involved in getting a DUNS number?

No. Obtaining your DUNS number, using the online lookup tool, and updating your D&B business profile are all free. Be wary of third-party services charging fees for DUNS number registration - this is unnecessary. D&B's paid services cover credit monitoring and business intelligence reports, not the DUNS number itself.