What is a CIN? A Complete Guide to Corporate Identification Numbers

What is a CIN?

A Corporate Identification Number (CIN) is a 21-character alphanumeric code issued by the Registrar of Companies (ROC) to every company incorporated in India under the Companies Act. Once a CIN is assigned at the time of incorporation, it stays with the company for its entire legal lifetime. Even when companies change their name, registered office, or authorized capital, the CIN remains unchanged — it is the single stable identifier that MCA uses in all filings, master data, and public searches.

Limited Liability Partnerships (LLPs) have their own equivalent called an LLPIN, and Foreign Companies get an FCRN. But for the vast majority of Indian companies — private limited, public limited, One Person Companies, Section 8 non-profits, and government companies — the CIN is the canonical identifier you will see on every MCA filing, MoU, bank document, and statutory notice.

The six segments of a CIN

Although it looks like random characters, a CIN is actually a highly structured identifier. It encodes six distinct pieces of information about the company, in a fixed order. Once you know the pattern, you can read a CIN almost at a glance.

The six segments, in order, are: (1) Listing status — 1 character; (2) Industry classification — 5 characters; (3) State code — 2 characters; (4) Incorporation year — 4 characters; (5) Ownership type — 3 characters; (6) Registration number — 6 characters. Together they total exactly 21 characters.

Consider a sample CIN like U72200KA2014PTC075612. Breaking it down: U (unlisted) + 72200 (computer programming, consultancy and related activities) + KA (Karnataka) + 2014 (year of incorporation) + PTC (Private Limited Company) + 075612 (MCA-assigned registration number within that state and year).

Segment 1 — Listing status (1 character)

The first character of a CIN indicates whether the company is listed on a recognised stock exchange. 'L' marks a listed company; 'U' marks an unlisted company. The overwhelming majority of Indian companies are unlisted, so you'll see 'U' at the start of most CINs you encounter.

Because only a small fraction of companies are publicly listed, this prefix is a quick way to identify listed entities when scanning a CIN list.

Segment 2 — Industry (NIC code, 5 characters)

The next five characters are the National Industrial Classification (NIC) code declaring the company's primary business activity at the time of incorporation. NIC codes are maintained by the Ministry of Statistics and Programme Implementation and track India's industrial taxonomy in five-digit granularity.

Keep in mind that the NIC code in the CIN reflects what the company declared at incorporation. Companies may expand, pivot, or shift activities over time without updating the NIC code captured inside the CIN. For that reason, the industry code inside a CIN should be treated as an approximate indicator rather than a guarantee of current operations.

Segment 3 — State code (2 characters)

Characters 7 and 8 of the CIN carry the two-letter Indian state code of the state where the company's registered office sits at the time of incorporation. For example, MH for Maharashtra, KA for Karnataka, DL for Delhi, TN for Tamil Nadu, and so on.

If a company later moves its registered office to a different state, it goes through a formal process of updating the ROC, but the original state code embedded in the CIN does not change. So a CIN starting with KA may currently have its registered office in a different state. Always check the current master data rather than inferring from the CIN alone.

Segment 4 — Year of incorporation (4 characters)

Characters 9 through 12 are the four-digit year of incorporation. This is the single most useful piece of information encoded in the CIN for anyone doing due diligence — it tells you at a glance how old the company is without needing to look up the full record.

Combined with the state code that precedes it, the year helps you cross-reference against historical economic events. A cluster of 2016–2017 incorporations in Maharashtra may reflect the post-demonetisation formation wave; a cluster of 2020 incorporations across multiple states often reflects the pandemic-era surge in tech companies.

Segment 5 — Ownership type (3 characters)

Characters 13 through 15 encode the ownership structure and liability form. Common values include: PTC for Private Limited Company, PLC for Public Limited Company, OPC for One Person Company, NPL for Section 8 non-profit, FTC for foreign subsidiary (Private), FLC for foreign subsidiary (Public), GOI for Government of India undertaking, and SGC for State Government company.

This is the segment that tells you the legal form of the entity. A PTC company is bound by private-company rules under the Companies Act; a PLC is subject to stricter SEBI and disclosure norms; an NPL is a non-profit with different dividend and reserve rules.

Segment 6 — Registration number (6 characters)

The final six characters are a sequential registration number assigned by the ROC at the time of incorporation. This is the only segment of the CIN with no encoded meaning — it is simply a counter within the combination of state code, year, and ownership type.

Two companies incorporated in the same state, in the same year, and with the same ownership type will have sequential (or near-sequential) registration numbers. This occasionally lets you estimate how active a particular ROC office was in a given year.

Where you'll see CINs

Under Section 12 of the Companies Act 2013, every Indian company is required to display its CIN on its letterhead, invoices, notices, website, and all official publications. That means if you're doing basic due diligence, the CIN should be visible on the company's own communications before you even query MCA.

When searching CorpIntel — or any public MCA database — the CIN is the most reliable search key. Company names can collide, registered addresses can change, but the CIN is immutable over the life of the entity.