GS1 Company Prefix
A GS1 Company Prefix is the unique number a GS1 Member Organization (GS1 US, GS1 UK, GS1 Germany, and similar national bodies) licenses to a company as the base for every GS1 identifier it creates. GTINs, GLNs, and SSCCs are all built by appending a reference number and check digit to a company's prefix, so the prefix itself never appears on a barcode alone — it's the namespace, not the identifier. Its length varies by GS1 Member Organization and by how many items a company expects to identify: a shorter prefix leaves more digits free for item references, a longer prefix leaves fewer.
What the prefix actually is
GS1 licenses identification capacity to companies through their national GS1 Member Organization — GS1 US in the United States, with equivalent bodies in most other countries. What a company receives is a Company Prefix: a block of digits reserved to it alone, forming the starting portion of every GTIN, GLN, and SSCC it subsequently creates.
A GTIN, for example, is built from three parts: the Company Prefix, an item reference number the company assigns internally, and a check digit calculated from the rest. The prefix is what makes the whole number globally unique to that company; the item reference is what makes each product within the company's catalog unique.
Why prefix length varies
GS1 Member Organizations assign prefixes at different lengths depending on how many distinct items, locations, or logistics units a company needs to code. The relationship is a trade-off: the digits not used by the prefix are available for the item reference, so a shorter prefix supports a much larger number of unique products, and a longer prefix supports fewer.
A company that expects to identify a handful of products gets a longer prefix with little room left over; a company issuing tens of thousands of SKUs needs a shorter prefix to leave enough reference digits. This is also why a company that outgrows its original allocation — through acquisition, new product lines, or simple catalog growth — sometimes has to apply for an additional prefix rather than extending the one it has.
One prefix, several identifier types
The same Company Prefix underlies more than just product barcodes:
- GTIN (Global Trade Item Number): identifies a specific product or trade item
- GLN (Global Location Number): identifies a physical or legal location — a warehouse, a distribution center, a business unit
- SSCC (Serial Shipping Container Code): identifies an individual logistics unit, like a pallet, for shipment tracking
Because all three draw from the same licensed prefix, a company's GTINs and its GLNs share a recognizable numeric root, which is one of the things a GDSN data pool or trading partner checks when validating that a submitted identifier actually belongs to the company claiming it. A prefix obtained secondhand, reused from a discontinued product line, or assigned to the wrong legal entity is a common source of GDSN validation failures and duplicate-GTIN disputes.
Frequently asked questions
Is a GS1 Company Prefix the same as a GTIN?
No. The Company Prefix is the licensed base number assigned to a company; a GTIN is a full product identifier built from that prefix plus an item reference number and a check digit. The prefix alone never appears as a standalone barcode — every GTIN a company issues starts with its prefix but adds more digits on top.
Why do GS1 Company Prefixes have different lengths?
Prefix length trades off against how many items a company can code: fewer prefix digits leave more digits available for item reference numbers, so companies with large SKU counts are assigned shorter prefixes, and companies with only a few products are assigned longer ones. GS1 Member Organizations set the length at assignment based on the company's declared need.
How does a company get a GS1 Company Prefix?
By registering with the GS1 Member Organization in its home country — GS1 US for U.S. companies, with equivalent national bodies elsewhere, more than 100 in total worldwide. The Member Organization licenses the prefix and, from it, the company generates its own GTINs, GLNs, and SSCCs internally rather than requesting each identifier individually.
Does the same GS1 Company Prefix cover GTINs, GLNs, and SSCCs?
Yes. All three identifier types are built from the same licensed prefix, just combined with different reference-number schemes for products, locations, and logistics units respectively. That shared root is part of how trading partners and GDSN data pools verify that an identifier actually traces back to the company presenting it.