Cost structure / standard tiers
There is no direct fee for these reference numbers themselves, but errors in recording or transmitting them create downstream costs.
| Reference Number | Format | Typical Cost Impact of Error |
|---|---|---|
| Booking number | Carrier-specific alphanumeric | Booking mismatch can delay container allocation by 1-2 days |
| Bill of lading number | Carrier-specific alphanumeric | Incorrect B/L number on AMS filing can trigger manifest hold |
| Container number | 4 letters + 7 digits (ISO 6346) | Transposed digit causes terminal tracking lookup failure, 0.5-1 day delay to locate |
| Seal number | Carrier/shipper-assigned numeric | Mismatch flags cargo for inspection, 1-3 day delay |
The check digit on a container number (the 7th digit) can be used to validate the number was transcribed correctly before relying on it for tracking.
Risk mitigation / operational guidance
Use the container number, not the booking or B/L number, for terminal appointment systems and gate tracking — these systems are indexed by equipment, not by shipment contract. Validate container numbers against the ISO 6346 check-digit formula when manually transcribing from documents, since a single transposed digit will return no results or, worse, results for an unrelated container. Keep all three reference numbers (booking, B/L, container) recorded together in the shipment tracking sheet from the start, since the booking number is often the only reference available before the container number is assigned at origin. For house bill of lading shipments booked through an NVOCC, remember that the carrier's own tracking system reflects the master B/L number, which may differ from the house B/L number provided by the NVOCC.