Equipment unit · VIN-decoded · NHTSA vPIC

1UNST442XCS100133

Not yet decoded
Carriers run under2
15 mo
Inspections2
all-time
OOS inspections0
of 2
First seenJan 3, 2025
TX
Last seenApr 17, 2026
TX
Inspected under 2 different carriers in 15 months
A unit that bounces between many operators can indicate slip-seating, heavy sub-haul, or double-brokering. Review the carrier timeline below for load integrity — context for human judgment, not a verdict.
01

Decoded identity

From the 17-character VIN via NHTSA vPIC

This VIN has not been decoded yet — the unit's carrier, inspection and plate history below is reconstructed from the FMCSA inspection feed regardless.

Decode evidence & sources

Deterministic structure

These fields come directly from VIN positions and the published checksum calculation, with zero store IO.

World manufacturer identifier
1UN

Deterministic · VIN positions 1–3.

Vehicle descriptor section
ST442

Deterministic · VIN positions 4–8.

Check digit
X · valid

Deterministic · position 9; calculated value X.

Model year candidates
1982 or 2012

Position 10 repeats every 30 years; both candidates are retained and neither is silently selected.

North American serial sequence
100133

Deterministic · positions 12–17 for a North American WMI.

Sourced platform inference

The prefix store publishes only at support ≥ 3 and purity ≥ 90%. Prefix confidence is shown beside every established platform claim.

Not established

No supported platform claim is established for this prefix

The resolver answered successfully but returned no row above the evidence floor. This does not mean the vehicle has no platform or that no data exists; it means this store cannot make the claim.

Not established

  • platform make
  • platform model
  • model line
  • generation
  • cab type

These are withheld claims, not negative findings.

02

Inspection history

Every roadside inspection of this VIN, newest first · Jan 3, 2025 – Apr 17, 2026

DateStateLevelViol.OOSCarrier (DOT)Plate
Apr 17, 2026TXI · Full3GUARDIAN OILFIELD SERVICES INC 1813088251B799/TX
Jan 3, 2025TXI · Full3DIAMOND B OPERATING LLC 2120653203C934/TX
03

Carriers this unit has run under

2 distinct carriers · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
GUARDIAN OILFIELD SERVICES INC1813088Apr 17, 2026Apr 17, 20261OK
DIAMOND B OPERATING LLC2120653Jan 3, 2025Jan 3, 20251TX
Names are left-joined from the FMCSA census; a DOT with no census match falls back to its number.
04

Plate & unit-number history

The same truck under different plate registrations across carriers

PlateState / prov.Unit no.CarrierDate rangeInsp.
251B799TXGUARDIAN OILFIELD SERVICES INCApr 17, 2026Apr 17, 20261
203C934TXDIAMOND B OPERATING LLCJan 3, 2025Jan 3, 20251
Sources: FMCSA SAFER · L&I · NHTSA vPIC