Reference library
Guides and reference
Guides, worked examples, code tables and a quick checker. Each standards-dependent article names its source and review date. These are reference aids; none of them declares a unit safe, compliant or operationally released.
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In-depth guides
ISO 6346 container numbersOwner code, category, serial and the check digit, with a worked example.
Container size & type codesHow to read the 22G1-style code stencilled beside the number.
BIC codes & owner prefixesThe registered three-letter prefix, and how to look one up.
ILU codes (EN 13044)Intermodal loading units and their tie to ISO 6346.
UIC wagon numbersTwelve-digit rail numbers with a Luhn check digit.
Errors the check digit missesWhat it catches, its blind spot, and the O-versus-0 trap.