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OIN Lookup – Find a Dutch Organisation Identification Number

Look up the OIN of a Dutch organisation by name, OIN or KvK number, and see its parent, sub-OINs and how the number is built.

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How to use the OIN Lookup

  1. 1 Type (part of) an organisation name, an OIN or a KvK number, for example “gemeente Utrecht”.
  2. 2 Press Search and pick the organisation from the results.
  3. 3 Copy the OIN, open its parent or sub-OINs, or copy a link to share the details.
  4. 4 Bookmark organisations you look up often, so you find their OINs again in one click.

What is an OIN?

An OIN (Organisatie-identificatienummer, organisation identification number) is a 20-digit number that identifies an organisation when it exchanges data with the Dutch government. It is used in Digikoppeling messages, in the subject of PKIoverheid certificates and in services such as BSNk. Logius issues OINs and publishes them in the central OIN register (COR).

How an OIN is built

According to the OIN Stelsel, every OIN has three parts:

  • Prefix (8 digits) – says which register the number comes from: 00000001 RSIN and 00000003 KvK number from the Business Register, 00000002 fiscal number from the Tax Administration, 00000004 a sub-OIN issued by Logius, 00000009 a healthcare provider, 00000099 a test OIN.
  • Number – the identifier from that register, for example the 8-digit KvK number.
  • Suffix – zeros that pad the OIN to 20 digits.

So 00000003273653230000 contains KvK number 27365323. Enter any complete OIN in the lookup and the tool shows this breakdown, even when the number is not in the register.

OIN holders and sub-OINs

A sub-OIN identifies part of an organisation – a department, a shared service or a system – that exchanges data on its own but has no separate legal status. It always belongs to a parent OIN, the OIN holder. The lookup shows the parent of every sub-OIN and lists the sub-OINs of each holder.

Where the data comes from

The lookup combines two public sources and refreshes them every day:

  • the Logius OIN register (COR) – name, status (active, pending or withdrawn), KvK number, parent OIN and issue date;
  • the BSNk list of BSN-authorised parties – organisations that may request BSN keys from BSNk, based on the RvIG authorisation list. These are marked BSN-authorised.

When both sources list an OIN, the details from the Logius register take precedence. The tool is a convenience copy: for official confirmation, use the Logius register itself.

Sources

Frequently asked questions

How do I find the OIN of an organisation?

Type the organisation name, its KvK number or part of the OIN and press Search. Open a result to see the full OIN, its status, parent and sub-OINs.

What does an OIN look like?

It has 20 digits: an 8-digit prefix for the source register, the number from that register (such as a KvK number or RSIN) and trailing zeros. For example 00000003273653230000 is based on KvK number 27365323.

What is the difference between an OIN and a sub-OIN?

An OIN identifies an organisation. A sub-OIN (prefix 00000004) identifies a part of it, such as a department or system, and always belongs to a parent OIN.

How do I get an OIN?

Organisations that exchange data with the Dutch government apply to Logius. The OIN is then published in the Logius OIN register.

What does “BSN-authorised” mean?

The organisation is on the BSNk list of parties that may request BSN keys, based on the RvIG authorisation list. It says nothing about which data the organisation may use.

How up to date is the data?

Both sources are downloaded every day; the date of the last update is shown under the results.

Where are my bookmarks stored?

In your browser. When you are signed in they are also saved in your account and appear on your other devices. You can turn this off in Sync settings, which removes them from your account again.

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