MONSTER NINE HIN Decoder
Hull Identification Numbers beginning with NIO were assigned by the US Coast Guard to MONSTER NINE of CYPRESS, CA. The company is recorded as out of business since 2009 — 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
NIO
Location
CYPRESS, CA
In business
since 2006
Status
Out of business (2009)
MONSTER NINE hulls (2006–2009) 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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MONSTER NINE HIN FAQ
What does a MONSTER NINE HIN look like?
It starts with the three characters "NIO" — the Manufacturer Identification Code the US Coast Guard assigned to MONSTER NINE — followed by a 5-character hull serial and a 4-character date code, 12 characters total. MONSTER NINE hulls (2006–2009) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is MONSTER NINE still in business?
USCG records list MONSTER NINE as out of business since 2009. 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 MONSTER NINE HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. MONSTER NINE hulls (2006–2009) 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, "MONSTER NINE HIN Decoder," carwhere.com/hin-decoder/nio, last verified 2026-06-12.