I Have Two DUNS Numbers: What Do I Do?

You search your business name on D&B’s lookup tool and find two DUNS numbers instead of one. Or a platform verification fails, and when you dig in, you discover a second number you never knew about. It’s an unsettling moment, because DUNS numbers are meant to be unique, one per business location or entity.

The good news is that this is a known problem with a sensible way to approach it. This guide explains why it happens, how to work out whether the second number is a real duplicate or perfectly legitimate, and what to do next. If you already know it’s a duplicate and want hands-on help, our service page on merging and resolving duplicate DUNS numbers covers that.

First, Don’t Panic and Don’t Apply Again

The most common mistake after finding two numbers is to apply for a third “clean” one, or to start another application hoping it replaces the others. That usually makes things worse. Every new application can create another record, and platforms can get confused about which number belongs to you.

Pause new applications until you understand what you have.

Step 1: Is It Really a Duplicate?

Two DUNS numbers don’t always mean a mistake. D&B’s number identifies a specific business entity at a specific location, so more than one number can be perfectly normal in situations like these:

• Separate legal entities. A parent company and its subsidiary, or two sister companies, each have their own number.
• Different locations. A branch or additional office may have its own DUNS number, separate from your headquarters.
• A different business with a similar name. Another company may simply share a similar name with yours.

It is more likely a true duplicate if both records describe the same legal entity at the same address, for example the same GST, CIN or PAN-registered business, with minor differences such as spelling, a trade name or an abbreviation.

Step 2: Compare Both Records Side by Side

Look up each number using D&B’s official D-U-N-S lookup and note, for each one:

• The business name exactly as shown
• The address
• Phone number and website, if listed
• Whether it matches your registration documents

Then compare them against your own paperwork, such as your Certificate of Incorporation, GST certificate and address proof. In most real duplicates, one record is clean and matches your documents, while the other has a typo, an old address or a trade name.

If one of the records is wrong rather than duplicated, our guides on a DUNS number showing the wrong company name and fixing incorrect DUNS number details are worth reading first.

Why Duplicate DUNS Numbers Happen

Duplicates are usually accidental. The common causes are:

• Applying twice because the first application seemed stuck, a situation we cover in DUNS number stuck in pending
• Slightly different details in each application, such as “Pvt Ltd” in one and “Private Limited” in the other
• A change of address or name that D&B treated as a new entity
• A third party (an agency, accountant or former employee) who applied on your behalf without telling you
• D&B’s own data sources, which sometimes create a record from public information before you ever apply

Step 3: Decide Which Number You’re Currently Using

Before anything is changed, check where each number is already in use. Look at:

• Your Apple, Google Play, Microsoft or Meta verification
• Any supplier or buyer onboarding forms
• Your credit file or any D&B product you may use

The number already linked to a successful verification is the one you’ll want to protect. Don’t change your details on a platform until you know which record will remain.

Step 4: Tell D&B About the Duplicate

This is the step that matters most, and it’s where we want to be honest about what we could verify.

D&B’s official pages we reviewed don’t publish a step-by-step “merge your DUNS numbers” procedure, and D&B’s U.S. D-U-N-S Manager tool is described for viewing and requesting updates to your business information, not specifically for merging records. D&B’s page does point businesses to its customer service channel (service.dnb.com) for further help, so that is the sensible official starting point.

When you contact D&B, include:

• Both DUNS numbers
• The legal name and address you believe is correct
• A short explanation: “These two records appear to belong to the same business”
• Supporting documents showing your legal name and address
• Your role in the business, since D&B generally wants to deal with an owner, director or authorised representative

D&B reviews requests and decides what to do. We can’t promise a particular outcome or timeline, and anyone who guarantees a “guaranteed merge in X days” is promising something only D&B controls.

What Usually Happens Next

Based on how D&B describes its data process, the likely outcomes are that D&B treats one record as the correct one and retires or links the other, or concludes the two are different entities and leaves both. In either case, keep a record of your correspondence with D&B.

While you wait, keep using the number that’s already tied to your working verifications, and avoid submitting new applications.

Step 5: Recheck and Retry Your Platform

Once D&B confirms the outcome, run the lookup again and make sure the surviving record matches your documents exactly. Only then retry any platform verification that was failing. Platforms read D&B’s data, so retrying too early usually brings back the same error.

How to Avoid Getting a Second Number

• Check the lookup before you apply, every time, even if you think you never had one
• Use your exact legal name and registered address, matching your documents
• Keep one person responsible for DUNS matters in your business
• Update, don’t re-apply, when your details change
• Keep your confirmation email, so you can prove which application was yours

If you’re applying for the first time, our guide on common DUNS application mistakes shows how to avoid creating a problem in the first place.

Want Your Duplicate DUNS Numbers Sorted ASAP? Connect With DUNS Assist

If duplicate numbers are blocking a platform verification and you want it resolved quickly, contact DUNS Assist. We help you and consult you through the entire process, from working out which record is correct to preparing the right request for D&B. We are an independent service and not affiliated with Dun & Bradstreet.