What is a D-U-N-S Number?

A D-U-N-S Number is a nine-digit identifier issued by Dun & Bradstreet for a business location. D&B’s lookup guide says the number is assigned at branch level and links to a business credit file; a business with several locations or subsidiaries may therefore have several linked numbers. The digits themselves are an index, not a credit score or a statement that a company is trustworthy.

A customer, supplier or lender can use that index to find the entity D&B records. D&B says organizations may use a number to review business credit information, maintain records, onboard a supplier or conduct compliance work in its D-U-N-S overview. A company asked for the number should therefore find out which legal entity and physical location the requester intends to evaluate. Supplying a headquarters number for a branch purchasing account may point the reviewer at the wrong record.

A D-U-N-S Number is useful when the counterparty’s process explicitly asks for it. It is not required simply to operate a business: D&B states that point on its request page. If a customer’s form asks for one, provide the verified number for the relevant entity; if it asks for a tax ID or a federal award identifier, use the other identifier instead.

These three identifiers can appear in the same onboarding packet, but they are issued by different organizations. The IRS says an Employer Identification Number is a federal tax ID for businesses and other entities. D&B issues the D-U-N-S Number for its business data. SAM.gov issues a Unique Entity ID, or UEI, for the federal entity system. No one of these numbers is a universal replacement for the other two.

The important historical change occurred on April 4, 2022. GSA announced that SAM.gov and other GSA systems would use the UEI as the authoritative entity identifier instead of DUNS. D&B’s own FAQ says a D-U-N-S Number is no longer required for US federal contracts, even though companies and other governments may still use it.

If a procurement form still says “DUNS required for SAM registration,” verify whether the form is stale. For a federal prime-award application, SAM.gov’s current registration page says the entity must register and receives a UEI during that process. A UEI-only request is a different path for organizations that do not need full registration, such as certain subawardees. A UEI alone cannot be used to apply directly for federal awards.

A supplier may use D-U-N-S as one field in a vendor record. A lender may use it to find D&B’s business credit file. D&B’s use-case page specifically mentions loan, credit and vendor applications. The number speeds identification only if the attached business name, address and branch are accurate. It does not tell the reviewer whether the company has been approved for credit or a manufacturer’s partner program.

Imagine a company with a manufacturing subsidiary and a separate sales company. A distributor opening a sales-company account needs the sales company’s identity, not an unrelated manufacturing-site number. Because D&B assigns identifiers at branch level, use the lookup result to confirm the name and address the counterparty will see. If the address is out of date, correct the record before relying on the number in an urgent application.

Channel authorization is a separate relationship. The manufacturer or distributor decides whether a firm may resell or service its products. A resale certificate addresses the tax treatment of a purchase, not that authorization. The channel-role guide explains which counterparty normally grants access to each tier. This prevents a new reseller from mistaking a list of business identifiers for a completed partner application.

Start with D&B’s D-U-N-S Number Lookup. D&B says the lookup can search your own company or another company. Use the legal name and physical address that will appear in the application, then inspect the result before submitting it. A familiar trade name may map to a different legal entity, and a moved office may still have an old address in the profile.

D&B’s lookup page says not every company has a number; it also says a mismatch in phone number or address can cause a failed search. A failed search is therefore a prompt to verify spelling and location, not immediate proof that a new request is needed. D&B’s request page explicitly tells applicants to check first.

If the record exists but details are wrong, D&B offers a Profile Manager for eligible US-based non-public companies. A verified owner, director or officer can request updates to basic business details. D&B reviews and validates submissions; the page says it does not guarantee that every requested change will be accepted. Correcting an existing record is a different task from creating a new identifier.

D&B’s request path begins with a lookup and selection of the business category. The applicant provides business information, and D&B may contact a representative to validate it before issuing the number by email. Gather the legal business name, physical address, phone and the details of the particular location so that validation does not stall over inconsistent records.

As of November 2026, the standard request is free. D&B says normal processing can take up to 30 business days. Its optional paid expedited service targets delivery within eight business days after successful submission, according to its current timing explanation. Those are D&B’s stated processing windows, not a promise that every case will clear identity validation at once. If a customer’s onboarding deadline is close, ask the customer whether it will accept a pending request while D&B works.

Do not purchase an unrelated service because an application screen offers it next to the free number. D&B says there is no charge to request, receive or maintain a D-U-N-S Number on the same request page. Expedited processing is optional. Keep the confirmation email and the exact legal name and location used; those details make later supplier and credit applications easier to reconcile.

A number can remain the same while the underlying record changes. D&B says in its request FAQ that the number itself does not expire. That does not mean the business profile is frozen. Address, ownership and branch information can change, and D&B’s Profile Manager is designed for eligible company representatives to request updates.

For example, after moving a branch, a company might put its old D-U-N-S Number on a new supplier application. The identifier may still be correct for that branch, but the address mismatch could delay review. D&B’s lookup help specifically flags phone or address mismatch as a reason a record is hard to find. Check the profile before sharing the number, then request an update if the record is stale.

A D&B file can include credit-related information that changes over time, but the number by itself contains no rating. D&B’s lookup page makes that distinction. A supplier who needs to assess trade risk must review the actual record and its date, rather than treating the existence of a D-U-N-S Number as credit approval.

For US federal work, begin at SAM.gov entity registration, not at D&B. SAM.gov offers two paths: full entity registration for directly bidding on contracts or applying for assistance, and a UEI-only request for entities that need an identifier without applying directly. The page says a UEI-only request asks for legal business name and physical address, while full registration asks for more information.

A prime contractor should choose full registration because SAM.gov says a UEI alone does not enable direct applications for federal awards. An organization that only needs to be reported as a subawardee may need just the UEI. GSA’s transition announcement explains the switch from DUNS and says already registered entities were assigned a UEI. If you are already in SAM.gov, check your entity workspace before requesting anything new.

The SAM.gov registration checklist lists legal name, physical address and additional registration data for federal award applications. It says SAM.gov validates name and address and provides a help-ticket path if validation fails. This is a separate validation process from D&B’s. Matching your legal name across systems helps avoid confusion, but an existing D-U-N-S Number does not complete SAM.gov registration.

A company name can be entered in several ways across vendor systems, so compare the D&B result with the legal buyer on the proposed account. If a branch has moved, do not silently send the headquarters number just because that record is easier to find. D&B’s lookup guidance says phone and address mismatches can prevent a result from appearing, and its Profile Manager gives eligible verified representatives a route to request corrections.

If a counterparty’s form requires an identifier before D&B completes validation, tell the counterparty which legal entity is applying and that the number is pending. D&B’s request page describes a validation step before issuance. A made-up or borrowed number would point the counterparty to another business record and make the application harder to reconcile later.

The most consequential mistake is following old instructions that send a federal applicant to D&B for a DUNS before SAM.gov. GSA replaced that identifier in its systems in 2022. Another is paying for the number when the ordinary D&B request is free. Paid speed is an optional service, not a prerequisite.

A third mistake is sending a headquarters identifier for a different physical location without checking the branch record. D&B says numbers are assigned at branch level. The fourth is assuming the number proves credit strength or brand authorization. It identifies the D&B file; the reviewer still assesses that file, and the manufacturer separately decides partner rights. Use the identifier for the question it answers.