DION CUSTOM BOAT HIN Decoder
Hull Identification Numbers beginning with DIO were assigned by the US Coast Guard to DION CUSTOM BOAT of WALTHAM, MA. The company is recorded as out of business since 2019 — common for older hulls, and useful to know when hunting parts or records. Enter the full 12-character HIN below for build date, model year, and serial — free, no account.
MIC
DIO
Location
WALTHAM, MA
In business
since 2008
Status
Out of business (2019)
DION CUSTOM BOAT hulls (2008–2019) 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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DION CUSTOM BOAT HIN FAQ
What does a DION CUSTOM BOAT HIN look like?
It starts with the three characters "DIO" — the Manufacturer Identification Code the US Coast Guard assigned to DION CUSTOM BOAT — followed by a 5-character hull serial and a 4-character date code, 12 characters total. DION CUSTOM BOAT hulls (2008–2019) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is DION CUSTOM BOAT still in business?
USCG records list DION CUSTOM BOAT as out of business since 2019. That's common for older hulls — the HIN still decodes normally, and the out-of-business date helps date the boat and guides parts-hunting toward salvage and owner groups rather than a dealer network.
How do I decode the year on a DION CUSTOM BOAT HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. DION CUSTOM BOAT hulls (2008–2019) 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 MA
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "DION CUSTOM BOAT HIN Decoder," carwhere.com/hin-decoder/dio, last verified 2026-06-12.