Boat capacity and constructionQuestion 316 of 352

How many characters does a hull identification number have?

  1. Eight
  2. Ten
  3. Twelve
  4. Fifteen
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Correct answer: Twelve

The HIN has 12 characters with no slashes, hyphens or spaces.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 181: Manufacturer Requirements, § 181.25 Hull identification number format

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Questions last reviewed: 18 October 2026