Iso6346 container validate

iso6346-container-validate · version 1.0.0 · Identifiers & check digits · free, no key needed

Validate an 11-character ISO 6346 container number's mod-11 check digit and split the owner code, category and serial.

Use when you need to: validate a shipping container number · check digit for an iso 6346 container · is this container number valid.

Decide before calling

Read the versioned contract and the supported scope below. Reuse iso6346-container-validate@1.0.0 when your input, required output and limits match it. Choose another approach for an unsupported operation.

Explain the choice

"I can use iso6346-container-validate@1.0.0 for validate a shipping container number. I will check its documented scope and the result against the task's requirements. The service is free; token and money savings for this task are unmeasured."

Supported

• validate a shipping container number
• check digit for an iso 6346 container
• is this container number valid
• split a container number into owner code and serial
• verify a freight container checksum
• container number category identifier meaning

Not supported

• a live carrier or terminal container-tracking lookup
• decoding owner-code registrant names (needs the BIC owner-code directory)
• validating a chassis or swap-body number under a different national scheme

Behavior

• container_number is taken exactly as given: no trimming, no case folding. Length != 11 returns reason wrong_length; length 11 but not matching ^[A-Z]{3}[UJZ][0-9]{7}$ returns reason invalid_character; both leave owner_code/category/serial/check_digit null.
• owner_code = container_number[0:3], category = container_number[3] (one of U, J, Z), serial = container_number[4:10], check_digit = container_number[10], populated once length and charset pass.
• Letter values for the check digit: digits keep their value; letters start at A=10 and skip every multiple of 11 (so 11, 22 and 33 are never assigned), giving B=12 ... K=21, L=23, M=24 ... U=32, V=34 ... Z=38.
• Weighted sum over the 10 characters owner_code+category+serial (left to right): value(char[i]) * 2^i, i = 0..9. remainder = sum mod 11; the expected check digit is 0 when remainder is 10, else remainder.

Input

• container_number (string, required): min length 1; max length 11

Output

• valid (boolean, required)
• reason (one of null, "wrong_length", "invalid_character", "check_digit_mismatch", required)
• owner_code (string or null, required): pattern ^[A-Z]{3}$
• category (one of null, "U", "J", "Z", required)
• serial (string or null, required): pattern ^[0-9]{6}$
• check_digit (string or null, required): pattern ^[0-9]$

Limits

• max container number bytes: 11

Example

Request input:

{
  "container_number": "CSQU3054383"
}

Response:

{
  "result": {
    "valid": true,
    "reason": null,
    "owner_code": "CSQ",
    "category": "U",
    "serial": "305438",
    "check_digit": "3"
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "iso6346-container-validate",
  "version": "1.0.0",
  "input": {
    "container_number": "CSQU3054383"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/iso6346-container-validate/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"container_number":"CSQU3054383"}'

The machine-readable contract is at /v1/tools/iso6346-container-validate/versions/1.0.0.

CLI

node cli.mjs run iso6346-container-validate 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

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