MASON MARINE FABRICATORS HIN Decoder
Hull Identification Numbers beginning with ONF were assigned by the US Coast Guard to MASON MARINE FABRICATORS of PORTLAND, TX. The company is recorded as out of business since 2006 — 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
ONF
Location
PORTLAND, TX
In business
since 1996
Status
Out of business (2006)
MASON MARINE FABRICATORS hulls (1996–2006) 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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MASON MARINE FABRICATORS HIN FAQ
What does a MASON MARINE FABRICATORS HIN look like?
It starts with the three characters "ONF" — the Manufacturer Identification Code the US Coast Guard assigned to MASON MARINE FABRICATORS — followed by a 5-character hull serial and a 4-character date code, 12 characters total. MASON MARINE FABRICATORS hulls (1996–2006) all use the current HIN format: a month letter (A=January…L=December), a certification-year digit, then two model-year digits.
Is MASON MARINE FABRICATORS still in business?
USCG records list MASON MARINE FABRICATORS as out of business since 2006. 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 MASON MARINE FABRICATORS HIN?
On current-format HINs the last two characters are the model year and the 9th–10th encode the certification month and year. MASON MARINE FABRICATORS hulls (1996–2006) 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 TX
Sources: USCG Manufacturer Identification Code database (uscgboating.org, refreshed monthly) · HIN format per 33 CFR 181 subpart C. Cite this page: CarWhere, "MASON MARINE FABRICATORS HIN Decoder," carwhere.com/hin-decoder/onf, last verified 2026-06-12.