What is a DUNS Number? A Complete Guide from A to Z

In today’s globalized world and rapidly growing international trade, building credibility and transparency in business is a must for every enterprise. One of the most recognized and widely used identifiers globally is the DUNS Number (Data Universal Numbering System). This article will help you understand what a DUNS number is, why it is important, and how to register for one – especially for businesses involved in import-export, technology, or those seeking to work with international partners.

1. What is a DUNS Number?

A DUNS Number (short for Data Universal Numbering System) is a global business identifier issued by Dun & Bradstreet. It consists of 9 digits and uniquely identifies a business entity worldwide in trade, finance, and supply chain operations.

The DUNS number is globally recognized and known by many names such as: DUNS, D-U-N-S, DUNS code, DUNS number, global business ID, D-U-N-S Registered, etc. It allows businesses to verify and assess each other’s creditworthiness in international transactions, bidding, contracts, and when complying with regulations in markets such as the US and EU.

In short, the DUNS number functions like a globally valid business registration number, used to verify company identity prior to exporting goods. Note that a DUNS number is required when registering with the FDA but does not replace FDA certification.

Although DUNS registration is not mandatory, it is highly recommended for businesses that wish to expand into international markets and build credibility with foreign partners.

*One of the most recognized and widely used identifiers globally is the DUNS Number*

See more: What are CO CQ? Understanding the difference between CO and CQ

2. Why You Need a DUNS Number

The DUNS number is more than just a business identifier – it’s a “passport” for Vietnamese companies to engage and trade smoothly in global markets. Here are the top reasons to get a DUNS number:

Join global supply chains: Many multinational corporations require suppliers to have a DUNS number to verify identity and evaluate trustworthiness.
Open vendor accounts on global platforms: Sites such as Apple Supplier Portal, Microsoft, and Cisco require a DUNS number.
Enhance credibility with foreign partners: The DUNS number lets partners look up your company via the global D&B database, increasing transparency.
Support FDA registration: The FDA requires a DUNS number for facility identification.
Comply with international financial reporting: Having a DUNS number helps companies appear on international credit and reporting systems.

See more: Registering for Imported Goods Quality Inspection | Step-by-Step Guide from A to Z

3. Steps to Register a DUNS Number

3.1 Prepare Required Documents

To apply for a DUNS number, gather the following:

Company profile (Name, address, phone, website, business sector, legal rep, number of employees, etc.)
Business registration certificate
Information on products and brands you own
Awards and recognitions from reputable organizations
Photos of your company headquarters and office with visible name and address

See more: Cybersecurity License | Essential Information for Businesses

3.2 Registration Process

Step 1: Contact CRIF D&B Vietnam for support and consultation.

Step 2: Confirm whether your business already has a DUNS number.

If yes, CRIF D&B will verify and update the information.
If not, CRIF D&B will collect your business data for new registration.

Step 3: Submit the prepared documents.

Step 4: CRIF D&B Vietnam verifies the provided information.

Step 5: CRIF D&B contacts D&B headquarters in the US to verify the data and issue the DUNS number.

Step 6: DUNS number, stamp, and certificate are issued to your business.

Step 7: The DUNS number is activated via your business email.

This process typically takes 5–7 working days but may last up to 30 days. Expedited registration is available if needed.

See more: Product Conformity Announcement | Required Documents and Procedures

4. ExtendMax’s DUNS Certification

As a pioneer in import-export consulting and global supply chain services, ExtendMax is officially registered in the Dun & Bradstreet system with a verified DUNS number.

ExtendMax – Vietnam’s Leading IT Equipment Import Consulting Provider

Experienced team: Over 10 years of expertise with a proven track record in complex tech import projects.
Prestigious international awards: SME100 Asia Award (2023 & 2024), Stevie Awards (2025).
Comprehensive consulting ecosystem:

Regulatory compliance and certification for ICT products
Civil cryptography and cybersecurity licensing
IOR/EOR and global supply chain management services
Import/export consulting for data centers and industrial tech equipment

Efficient and cost-saving: Our streamlined process helps clients reduce time and costs.

ExtendMax serves clients in over 30 countries including the US, Japan, Germany, South Korea, China, Italy, and Singapore, with major partners such as IBM, Dell, LEGO, Fujitsu, and Lenovo.

Contact for Consultation:

EXTENDMAX VIETNAM CO., LTD

Business Registration Address: P903, 9F, Tower A, Sky City Tower, 88 Lang Ha, Dong Da, Hanoi, Vietnam
HQ: ExtendMax Villa, C01-L18 An Vuong, Duong Noi Urban Area, Duong Noi Ward, Ha Dong, Hanoi
Hotline: 0915 836 555 | 024 6666 3066
Email: consultant@extendmax.vn | phuong.tran@extendmax.vn
Website: https://extendmax.vn