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U.S. Code of Federal Regulations
Regulations most recently checked for updates: Jan 21, 2026
All Titles
Title 33
Chapter I
Part 181-MANUFACTURER
Subpart C - Subpart C-Identification of Boats
§ 181.21 - Purpose, applicability and effective dates.
§ 181.23 - Hull identification numbers required.
§ 181.25 - Hull identification number format.
§ 181.27 - Information displayed near hull identification number.
§ 181.29 - Hull identification number display.
§ 181.31 - Manufacturer identification code assignment.
§ 181.33 - Conditions for use of manufacturer identification codes.
§ 181.35 - Removal of numbers.
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