Shipping Mark Number vs. SSCC: What Warehouse Teams Need To Know

Shipping Mark Number An identifier printed or encoded on shipping packaging for the supply-chain purpose described by 'Shipping Mark Number'. Warehouse teams encounter several identifiers on a single pallet or carton; distinguishing the shipping mark number from formal serialization standards like the SSCC prevents misuse and data mismatches.

The shipping mark number is a flexible, often human-readable reference used primarily for routing and visual identification. The Serial Shipping Container Code (SSCC) is a globally standardized, unique 18-digit number (when encoded as a GS1-128 barcode) intended for electronic data interchange and item-level tracking in GS1-enabled supply chains. Confusing the two leads to problems: labels intended to be scanned into a WMS as SSCCs may instead be logged as non-unique shipping marks, breaking traceability.

Key Differences

• Purpose: Shipping mark numbers are operational references for handlers; SSCCs uniquely identify logistic units for automated tracking and EDI.
• Standardization: Shipping marks have no universal numeric format; SSCCs follow GS1 rules and include a company prefix, serial element and checksum.
• Machine Use: Shipping marks are often read visually or by simple barcode; SSCCs are designed for robust scanning and electronic confirmation across systems.
• Uniqueness: Shipping marks may repeat across shipments if not centrally managed; SSCCs must be unique for each logistic unit.

When To Use Each

Use a shipping mark number when you need a short, visible code to help port handlers and warehouse pickers group cartons and match them to paperwork quickly. Use an SSCC when you need a globally unique identifier for automated receiving, EDI acknowledgements, cross-docking workflows, or when trading partners require GS1 compliance.

How To Coordinate Both On The Same Unit

Good labeling practice is to include both identifiers but clearly separate them visually and in your WMS mapping:

• Label Layout: Place the SSCC in a GS1-128 barcode block with the AI (00) application identifier; place the shipping mark number as bold text plus a human-friendly barcode (Code128) or plain text nearby.
• EDI/ASN Mapping: In your ASN, populate the SSCC field(s) for each logistic unit. Include the shipping mark number in a reference or shipment ID field so receivers can match documents to visible marks.
• WMS Rules: Configure inbound scanning logic that first looks for SSCC to accept and putaway, and treats the shipping mark number as a secondary search key for manual lookups.

Operational Risks Of Mixing The Two

Problems arise when warehouse staff or external partners treat a shipping mark as the SSCC or vice versa. Typical failures include duplicate SSCC scans (from reused shipping mark numbers), misapplied EDI confirmations, and delays while teams manually reconcile scanned data to packing lists. To avoid this, document labeling standards in supplier packaging guides and enforce label templates with distinct visual separation.

Practical Example

A consumer electronics importer receives a container where the supplier has printed the supplier order code as the large visible mark but encoded a GS1 SSCC barcode beneath it. The carrier scans the visible mark and records it in a handheld as the container unit. At the 3PL, scanning the SSCC into the WMS automatically creates the inbound receipt and links to the ASN. Because the shipping mark number is different from the SSCC, receiving staff use the visible mark to group cartons while the WMS maintains unique tracking via SSCC—the two identifiers are different but intentionally mapped in the system.

Best Practices For Implementation

• Supplier Packaging Specifications: Publish a label template with distinct locations for SSCC (barcode block) and shipping mark (human-readable text).
• Training: Teach receiving personnel the distinction and how to scan both identifiers when required.
• Label Verification: Run occasional audits where scanned SSCCs are matched against visible shipping marks to ensure correct mapping and supplier compliance.

In short, the Shipping Mark Number is a practical, visible shipment reference distinct from standardized identifiers like the SSCC. Use shipping marks for fast visual handling and the SSCC for unique electronic tracking; document and enforce how both appear on labels to prevent operational friction.