SSCC Validator

Paste one or many Serial Shipping Container Codes and this SSCC validator confirms each is structurally correct — right length, valid GS1 company prefix, and a check digit that actually computes. It is built for distributors in MRO, CPG, furniture, and industrial supply who carry SSCCs from suppliers into their own logistics and warehouse systems.

What it checks

The validator runs each SSCC through the same structural rules a GS1 scanner or EDI parser would apply, and explains every result in plain language:

• Length — an SSCC is exactly 18 digits. Codes that arrive in feeds as 17 digits (check digit stripped) or 20 digits (with a leading Application Identifier 00) are flagged and, where unambiguous, normalized for you.
• Extension digit — the leading digit (0–9) assigned by the brand owner to expand capacity. It is reported but never treated as an error on its own.
• GS1 Company Prefix — confirms the prefix segment is numeric and plausible, so you can tell a real allocated range from a placeholder like all-zeros.
• Serial reference — checks the remaining digits that make each logistics unit unique within a prefix.
• Check digit (Modulo 10) — recomputes the final digit and compares it to what was supplied. This catches the most common defect: a transposed or mistyped digit that still “looks” like a valid SSCC.
• Character hygiene — strips spaces, hyphens, and AI parentheses, and flags any non-numeric characters that would break a barcode or EDI field.

How an SSCC validator computes the check digit

The SSCC (Serial Shipping Container Code) is the GS1 identifier for a logistics unit — a pallet, carton, or shipping container — and it is the key field in an Advance Ship Notice (ASN) under EDI 856 and GS1 standards. Its 18 digits are an extension digit, the brand owner’s GS1 Company Prefix, a serial reference, and a single check digit.

That check digit uses the standard GS1 Modulo 10 algorithm. Reading the first 17 digits from the right, each is multiplied alternately by 3 and 1; the products are summed, and the check digit is whatever value brings that sum up to the next multiple of 10. Because every digit contributes, a single typo almost always changes the result — which is exactly why this check exists. The same math powers a GTIN check digit calculator, since GTIN, GLN, and SSCC all share the Modulo 10 scheme.

A structurally valid SSCC is not a guarantee the pallet exists, but an invalid one is a guaranteed downstream failure: rejected ASNs, mis-scanned pallets at receiving, and reconciliation breaks between what shipped and what your WMS expects. Validating at ingestion keeps those errors out of your canonical records. If you maintain product and logistics identifiers across hundreds of suppliers, Claro’s identity resolution and enrichment layer applies these same checks automatically and writes corrections back with provenance.

Related resources

FAQ

What is an SSCC and what is it used for? +

An SSCC (Serial Shipping Container Code) is an 18-digit GS1 identifier for a logistics unit such as a pallet or carton. It is encoded in the GS1-128 barcode on a shipping label and carried in the EDI 856 Advance Ship Notice, letting a receiving warehouse scan one label to identify everything on the unit. It identifies the container, not the products inside it.

How many digits should an SSCC have? +

Exactly 18: a single extension digit, the GS1 Company Prefix, a serial reference, and one check digit. If you see 17 digits the check digit was likely dropped, and 20 digits usually means the Application Identifier 00 is still prefixed. This validator detects both cases and tells you which you are looking at.

How is the SSCC check digit calculated? +

With the GS1 Modulo 10 algorithm. Take the first 17 digits, multiply them by alternating weights of 3 and 1 (starting from the rightmost of the 17), sum the products, and the check digit is the number that rounds that sum up to the next multiple of 10. The tool recomputes this and flags any mismatch.

Can two shipments have the same SSCC? +

They should not within the standard reuse window. GS1 recommends an SSCC not be reused for at least 12 months after the logistics unit leaves the supply chain. Duplicate SSCCs in the same period cause scanning and reconciliation errors, so deduplicating them at ingestion matters as much as validating their structure.

Does a valid SSCC mean the pallet data is correct? +

No. This validator confirms the code is structurally sound — correct length, prefix, and check digit. It cannot confirm the SSCC was actually assigned to a real shipment or that its contents match the ASN. Use it as a first gate to keep malformed codes out of your systems, then reconcile against the shipment record itself.