Once you’ve used up all the GTINs in your range, it’s impossible to add more using the same prefix. A new prefix will need to be issued.

The illustration below provides details of the different numbering capacities of different length GCPs:

Different length GCPs and their numbering capacities

Key: 

P = GS1 Company Prefix

I = Item Reference

C = Check Digit

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The first 7 to 11 digits are your GS1 Company Prefix (GCP) which you license from GS1 UK. The length of the prefix determines how many numbers you receive – the shorter the GCP, the more numbers you get. 

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After the GCP, in the middle of the GTIN, we have the item reference digits which are used to uniquely identify your products

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The last digit of the GTIN is always a check digit, calculated automatically to ensure integrity.