What Is a GLN? Global Location Number Explained

When three supplier feeds describe the same ship-to warehouse as “Memphis DC,” “MEM-01,” and “Distribution Ctr - Tennessee,” no automated join can reconcile them without a stable key. That key is the GLN — the GS1 Global Location Number. It is a 13-digit identifier that uniquely names every party and place in your supply chain, and it is the anchor that keeps location data trustworthy as catalogs change. Claro uses GLNs alongside other GS1 identifiers to resolve supplier identity, validate incoming records, and write clean location-attributed data back into PIM and ERP systems — so the ambiguity stops accumulating.

Definition

A GLN (Global Location Number) is a 13-digit GS1 identifier that uniquely names a legal entity, a function, or a physical place — a company, a warehouse, a store, a ship-to dock, or a billing department — so trading partners can reference the same location without relying on ambiguous names and addresses.

What makes GLNs powerful is their deterministic structure. A GLN is built from a GS1 Company Prefix, a location reference, and a single check digit computed with the same modulo-10 algorithm used for GTINs. That gives you a globally unique 13-digit key you can validate structurally before trusting it as a join key. Unlike a barcode on a product, a GLN does not describe an item — it describes an actor or a place in the supply chain.

GLNs come in three types that matter when you are cleaning data:

• A legal entity GLN identifies the business itself (Acme Industrial Supply, Ltd.).
• A function GLN identifies a role within that business (accounts payable, returns processing).
• A physical location GLN identifies a specific routable place (Dock 4 at the Memphis distribution center).

The same parent company can own hundreds of GLNs. They appear in EDI transactions (ship-to, bill-to, sold-to), in GDSN registrations where they identify data sources and recipients, and in GS1-128 logistics labels alongside the SSCC. The GLN is the location counterpart to the GTIN, which identifies trade items.

Why a GLN matters for product data

In product and supply-chain data, the recurring failure is party and location ambiguity. The same warehouse shows up as three different strings across three systems, and no join key ties them together. A GLN collapses that mess into one canonical reference, which is exactly the kind of stable anchor that matching, deduplication, and enrichment pipelines depend on.

Consider a few cross-industry cases. An MRO distributor receiving supplier feeds via GDSN uses the supplier’s GLN to attribute every incoming record to a trusted source, so provenance is unambiguous when two suppliers send conflicting specs. A CPG manufacturer shipping to a grocery retailer routes pallets using the retailer’s ship-to GLN, avoiding the costly chargebacks that come from a misrouted delivery. A furniture importer reconciling invoices matches bill-to GLNs rather than fuzzy company names, eliminating duplicate vendor records in the ERP. In each case the GLN is the deterministic key that lets you skip error-prone string matching on names and addresses.

That reliability also feeds AI-driven workflows. When a model enriches or validates a record, a clean GLN gives it a verifiable identity to attach claims to — “this price came from supplier GLN 0614141000012” — instead of a free-text vendor name that could be hallucinated or conflated. Canonical location identity is part of building a product knowledge graph that AI systems can trust. Claro treats GLNs as first-class keys for identity resolution and catalog matching, so source attribution and data provenance stay accurate through every enrichment cycle and write-back.

Before and after: location ambiguity vs GLN-anchored data

How GLNs fit into GS1 workflows

GLNs are rarely used in isolation. They interact with the rest of the GS1 system in predictable ways that matter for data pipeline design:

• GDSN registrations: Both the data source (supplier) and the data recipient (retailer or distributor) are identified by GLN. If a supplier’s GLN is missing or malformed, the data pool rejects the subscription. This is why GLN validation belongs at the point of ingestion, not after the fact.
• EDI 856 (Advance Ship Notice): The ship-from and ship-to locations are GLNs. A wrong GLN on an ASN can trigger automatic chargeback processes at major retailers before a human even sees the document.
• GS1-128 logistics labels: The GLN of the ship-to location and the SSCC of the logistic unit appear together, giving warehousing systems a deterministic receive instruction.
• Attribute provenance: When multiple suppliers send overlapping product specs, the supplier’s GLN is the key that lets you rank sources by reliability and surface the confidence score on each attribute.

Validating a GLN structurally — check-digit computation, correct length, known company prefix — is the first gate. The second gate is confirming it is live and registered with the appropriate GS1 member organization, which matters when you are using it as a permanent join key in a PIM or MDM.

Related

FAQ

How many digits is a GLN? +

A GLN is exactly 13 digits: a GS1 Company Prefix, a location reference, and a single check digit. The check digit is computed with the same modulo-10 algorithm used for GTINs, so you can validate a GLN’s structure without contacting GS1.

What is the difference between a GLN and a GTIN? +

A GTIN identifies a trade item — the thing being bought or sold. A GLN identifies a party or a place — a company, department, store, or shipping dock. They share the GS1 numbering scheme and often appear together on logistics labels, but they answer different questions: ‘what’ versus ‘who or where.’

Can one company have more than one GLN? +

Yes, and most do. A single business typically has one legal-entity GLN plus additional GLNs for each physical location and operational function — warehouses, retail stores, returns processing, accounts payable. Treating these as distinct keys is exactly what lets supply-chain systems route and reconcile precisely.

Where are GLNs actually used? +

GLNs appear in EDI transactions as ship-to, bill-to, and sold-to identifiers; in GDSN to identify data sources and recipients; and in GS1-128 logistics barcodes alongside the SSCC. Anywhere two trading partners need to agree on a party or location without relying on names and addresses, a GLN is the canonical reference.

How do I get a GLN? +

GLNs are issued through your national GS1 member organization once you obtain a GS1 Company Prefix. You assign location references within your prefix and compute the check digit. Validate any GLN you receive from a partner before using it as a join key, since transcription errors are common in supplier feeds.

How does Claro use GLNs in supplier data workflows? +

Claro treats the GLN as a first-class identity key. When supplier feeds arrive with inconsistent location names, Claro resolves them to their canonical GLN, attaches provenance to every enriched attribute (‘this spec came from supplier GLN 0614141000012’), and writes clean, GLN-anchored records back into your PIM or ERP — so location ambiguity stops accumulating as catalogs grow.