The EORI number (Economic Operator Registration and Identification number) is a unique identity number (customer number) from the Customs authorities in the EU.
The EORI-number starts with the country code for the EU-country that has assigned this. The rest is a number which is unique to this EU-country.
Who needs an EORI-number?
Businesses and private individuals exchanging electronic information directly with the Customs in EU, must have an EORI-number as an identification number.
If your business just imports goods from EU or just exports goods to EU, you do not need an EORI-number. In such cases, it is not your Norwegian business, but the importer / exporter in EU who is exchanging electronic information with the Customs Authorities in EU, either directly themselves or by a Customs agent.
How do I get an EORI-number?
You can apply to a Customs authority in one of the EU member states for an EORI-number.
You can read more about EORI numbers on the website of the European Commission.
Check the validity of an EORI number: EORI number validation