Colloquially, many know GTIN as a barcode, but technically, GTIN is the number found beneath the barcode symbol itself, and can therefore also be used for other technologies such as 2D barcodes and RFID tags.
When your company needs to encode the product’s weight in a barcode, the RCN-13 item number (Restricted Circulation Number) must be used. RCN-13 is represented in an EAN-13 barcode.
Products with an RCN cannot be exported to other countries, hence the name “Restricted.” If exporting variable-measure products to other countries, you must contact the GS1 organization in the relevant country.
En identifikationsnøgle starter altid med et virksomhedspræfiks. Et virksomhedspræfiks er et GS1 ID, som du køber i Mit GS1.
Der findes virksomhedspræfikser i forskellige længder: fra 7 cifre til 11 cifre lange. Det varierer efter antallet af numre, som du har behov for.
Præfikset suppleres med et x antal cifre for at opnå en identifikationsnøgle (for eksempel GTIN).
Jo kortere virksomhedspræfiks, desto flere frie positioner har du til at identificere produkter med. Med andre ord, jo kortere virksomhedspræfiks, desto flere identifikationsnumre kan du oprette. Dette kalder vi 'nummereringskapacitet'.
Det sidste ciffer er et kontrolciffer, der bekræfter, at koden er korrekt.
See below what you need to do once you have received your company prefix (between 7 and 11 digits) from GS1 Denmark and need to convert it into barcodes.
First, you must create the GTIN product numbers that the barcode will contain:
With 7 digits, you can form 100,000 pieces. GTIN Product Numbers
With 8 digits, you can form 10,000 pieces. GTIN Product Numbers
With 9 digits, you can form 1,000 pieces. GTIN Product Numbers
With 10 digits, you can form 100 pieces. GTIN Product Numbers
With 11 digits, you can form 10 pieces. GTIN Product Numbers

Nedenfor kan du se hvordan data synkroniseres imellem købere og sælgere vha. GS1 GDSN og GS1 Global Registry.
1. Loading of company data
2. Registering of company data
3. Subscription to seller's data pool
4. Publishing of company data
5. Confirmation receipt of company data
The first two digits are a GS1 prefix, either 26 or 28.
In the example below, the RCN item number 2623570001505 is shown, where the product weighs 150 grams.
One digit is available for the product reference number, allowing the allocation of 10 numbers (0–9) per prefix.
The following three digits (R1–R3) indicate the company reference number, and the next digit is the product reference number. The quantity is expressed in six digits.
The quantity indicated is normally expressed in grams. However, it is also possible to indicate, for example, centilitres (cl) or centimetres (cm) in the RCN item number. The unit for these quantities must be specifically agreed upon between the trading partners.
The last digit is a check digit, calculated using the Modulus 10 method. The check digit is used to verify both the RCN item number and the barcode symbol.
The first two digits are a GS1 prefix, which is 27.
In the example below, the RCN item number 2712341002251 is shown, where the product weighs 225 grams.
One digit is available for the product reference number, allowing the allocation of 10 numbers (0–9) per prefix.
The following four digits (R1–R4) indicate the company reference number, and the next digit is the product reference number. The quantity is expressed in five digits.
The quantity indicated is normally expressed in grams. However, it is also possible to indicate, for example, centilitres (cl) or centimetres (cm) in the RCN item number. The unit for these quantities must be specifically agreed upon between the trading partners.
The last digit is a check digit, calculated using the Modulus 10 method. The check digit is used to verify both the RCN item number and the barcode symbol.
As these numbers do not contain a GS1 prefix identifying the country in which the company is registered, products using these codes cannot be exported to other countries.
When exporting variable-measure products to other countries, you must contact the GS1 organization in the relevant country and obtain a company reference number there.
Please note that the structure of the RCN item number may differ from the structure used in Denmark.
Har du spørgsmål til hvordan du kan bruge vores standarder og services anbefaler vi, at du kontakter vores trænede rådgivere, som sidder klar til at guide dig godt igennem processen.
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or by mail: info@gs1.dk
If you have additional or other questions about our standards and services, you may find the answers below. You are, of course, always welcome to contact us directly.