Type or paste a container number, with or without spaces. The checker validates it against ISO 6346 and shows the owner code, category and how the check digit is worked out.
CSQU3054383 is a valid container number.
| Character | C | S | Q | U | 3 | 0 | 5 | 4 | 3 | 8 |
|---|---|---|---|---|---|---|---|---|---|---|
| Value | 13 | 30 | 28 | 32 | 3 | 0 | 5 | 4 | 3 | 8 |
| × weight | 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128 | 256 | 512 |
| = product | 13 | 60 | 112 | 256 | 48 | 0 | 320 | 512 | 768 | 4096 |
Total 6,185 ÷ 11 leaves 3: the check digit is 3.
A container number (ISO 6346) is 4 letters and 7 digits: the owner code (3 letters), the category (U, J or Z), a 6-digit serial number and the check digit.
To get the check digit, every one of the first 10 characters gets a value (digits keep theirs, A = 10 up to Z = 38, skipping 11, 22 and 33), is multiplied by 1, 2, 4, 8 … 512 by its position, and the results are added. The check digit is the total modulo 11; a result of 10 counts as 0. The table under the checker shows every step for the number you enter.
A container number (ISO 6346) has 4 letters and 7 digits: a 3-letter owner code registered with the BIC, an equipment category letter (U for freight containers), a 6-digit serial number and a check digit, e.g. CSQU3054383.
Each of the first 10 characters gets a value: digits keep theirs, letters run from A = 10 to Z = 38, skipping 11, 22 and 33. Each value is multiplied by 2 to the power of its position (1, 2, 4 … 512), the results are added up, and the check digit is that total modulo 11, with a result of 10 counted as 0.
The 4th letter is the equipment category: U is a freight container, J is detachable equipment that goes with a container (such as a clip-on generator set), and Z is a trailer or chassis.
The first three letters are the owner code. Shipping lines and leasing companies register their codes with the Bureau International des Containers (BIC); the BIC register at bic-code.org shows the owner of any code.
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