DOWNUNDER BOAT WORKS HIN Decoder
Hull Identification Numbers beginning with DUT were assigned by the US Coast Guard to DOWNUNDER BOAT WORKS of KELSEYVILLE, CA. The builder is listed in the USCG MIC database. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
DUT
Location
KELSEYVILLE, CA
In business
since 1989
Status
Listed active in USCG records
DOWNUNDER BOAT WORKS hulls (1989–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Free · no account · the HIN is on the transom, upper starboard (right) corner
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DOWNUNDER BOAT WORKS HIN FAQ
What does a DOWNUNDER BOAT WORKS HIN look like?
It starts with the three characters "DUT" — the Manufacturer Identification Code the US Coast Guard assigned to DOWNUNDER BOAT WORKS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. DOWNUNDER BOAT WORKS hulls (1989–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is DOWNUNDER BOAT WORKS still in business?
USCG records list DOWNUNDER BOAT WORKS of KELSEYVILLE, CA in the MIC database (registered 1989).
How do I decode the year on a DOWNUNDER BOAT WORKS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. DOWNUNDER BOAT WORKS hulls (1989–present) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits. Enter the full 12-character HIN above and the decoder works it out, including the legacy formats.
Other builders in CA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "DOWNUNDER BOAT WORKS HIN Decoder," carwhere.com/hin-decoder/dut, last verified 2026-06-12.