The Short Answer
A CIN (Corporate Identity Number) is a 21-character alphanumeric code issued by the Registrar of Companies (ROC), under India's Ministry of Corporate Affairs, at the moment a company is incorporated. It's your company's permanent legal fingerprint within India's corporate registry.
A DUNS number is a nine-digit identifier issued by Dun & Bradstreet, a private, international commercial data company. It's used for business identity verification and credit tracking — required by platforms like Apple's Developer Program, and referenced by international partners doing due diligence before working with your business.
One is a domestic legal registration; the other is an international identity and credit reference. They serve different audiences entirely.
Side-by-Side Comparison
| Detail | DUNS Number | CIN |
|---|---|---|
| Issued by | Dun & Bradstreet (private company) | Registrar of Companies, under MCA (Government of India) |
| Format | 9 digits | 21 characters (alphanumeric) |
| Who gets one | Any business type, in any country D&B operates | Only companies registered under the Companies Act (not proprietorships, partnerships, or LLPs) |
| Purpose | International identity & credit verification | Legal identity within India's corporate registry |
| Issued when | Upon request, any time | Automatically, at the moment of incorporation |
| Cost | Free (standard registration) | No separate fee — bundled into incorporation cost |
| Scope | International | India-specific |
What a CIN Actually Encodes
Unlike a DUNS number, which is just a sequential nine-digit code, a CIN is genuinely readable once you know the format — each section of the 21 characters means something specific:
- 1st character: Listing status —
Lfor listed on a stock exchange,Ufor unlisted. - Next 5 digits: Industry code, based on the National Industrial Classification (NIC).
- Next 2 characters: State code for the company's registered office (e.g.,
MHfor Maharashtra,KAfor Karnataka). - Next 4 digits: Year of incorporation.
- Next 3 characters: Company type —
PTCfor private limited,PLCfor public limited, and similar codes for other structures. - Final 6 digits: The company's unique registration number issued by the ROC.
For example, a CIN like U72200KA2020PTC123456 tells you at a glance: unlisted, IT-related industry, registered in Karnataka, incorporated in 2020, private limited structure. A DUNS number carries none of that embedded information — it's simply a lookup key into D&B's database.
Who Actually Gets a CIN — And Who Doesn't
This is where the two identifiers diverge most sharply. A CIN is exclusively for companies incorporated under the Companies Act — private limited companies, public limited companies, one person companies (OPCs), Section 8 (nonprofit) companies, and Nidhi companies.
If your business is a sole proprietorship or a traditional partnership firm, you will never have a CIN — those structures simply aren't registered through the ROC in a way that generates one. Even LLPs (Limited Liability Partnerships), despite also being registered through the ROC, don't get a CIN — they receive a separate identifier called the LLPIN instead.
A DUNS number has no such restriction. Whether you're a sole proprietor, a partnership, an LLP, or a private limited company, you can apply for and receive a DUNS number — Dun & Bradstreet's verification process just asks for whatever registration or identity documents apply to your specific business structure.
An Interesting Overlap Worth Knowing
Here's a detail that surprises people: your CIN is actually required as part of GST registration if your business is an incorporated company. So for company-structured businesses, the CIN indirectly feeds into your GST registration process — but it still has no connection to your DUNS number. If you're also trying to understand how GST fits into this picture, see our companion guide: DUNS Number vs GST Number.
A Real-World Scenario
Consider a private limited company incorporated in Bangalore in 2023. At the moment of incorporation, the Registrar of Companies automatically issues it a CIN — say, U72900KA2023PTC178432. That CIN now appears on every invoice, letterhead, and MCA filing the company produces, as legally required under the Companies Act.
Two years later, the same company wants to publish a mobile app under its business name and enrolls in Apple's Developer Program as an Organization. Apple's enrollment form has no field for a CIN at all — it specifically asks for a DUNS number. The company's founder now has to separately apply to Dun & Bradstreet, using much of the same underlying registration documentation, to get a completely different nine-digit identifier that Apple's system actually checks.
The CIN did its job perfectly for Indian regulatory compliance. It simply isn't the identifier international platforms are built to recognize.
Do You Need Both?
If your business is incorporated as a company in India, you already have a CIN automatically — there's no decision to make there. Whether you also need a DUNS number depends entirely on whether a specific platform, client, or process requires one. If you're not enrolling with Apple, Google, or working with international partners who specifically ask for a DUNS number, your CIN alone is sufficient for your Indian regulatory obligations. For a full breakdown of when a DUNS number actually becomes necessary, see our Getting Started guide.
Where Each One Actually Gets Used
It helps to think about these two identifiers in terms of who's asking for them, rather than what they technically are. Your CIN gets requested by: the Ministry of Corporate Affairs during any filing, banks when opening a current account for a private limited company, auditors during statutory audits, and anyone doing due diligence on your company through the public MCA portal.
Your DUNS number, by contrast, gets requested by: Apple during Organization account enrollment, Google Play Console during organization verification, international clients or suppliers running vendor onboarding checks, and occasionally banks or lenders evaluating international credit history. Notice these are almost entirely non-overlapping audiences — which is exactly why businesses that only operate domestically often go their entire lifetime without ever needing a DUNS number, despite having a permanent CIN from day one.
What Happens If You Change Your Business Structure
This is a scenario worth planning for if you're a growing business. If a sole proprietorship or partnership later incorporates as a private limited company, it receives a brand-new CIN at that point — proprietorships and partnerships never had one to begin with, so this isn't a change, it's the first assignment. If a private company later converts to a public company (or the reverse), the CIN's first character updates accordingly, though the rest of the code typically stays tied to the same underlying registration.
A DUNS number behaves differently during a restructuring. Since it's tied to your business's identity in D&B's records rather than your legal registration type, a significant structural change may require you to update your existing DUNS record with D&B directly, rather than being issued an entirely new number. It's worth checking your D&B record after any major legal restructuring to make sure the details still match your current registration.