Equipment unit · VIN-decoded · NHTSA vPIC

2021 Peterbilt 579

1XPBD49X5MD743836 · Truck-Tractor · TRUCK
Carriers run under2
23 mo
Inspections3
all-time
OOS inspections1
of 3
First seenMar 20, 2024
MI
Last seenFeb 15, 2026
IA
Inspected under 2 different carriers in 23 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

VIN
1XPBD49X5MD743836
Make
Peterbilt
Model
579
Model year
2021
Body class
Truck-Tractor
Vehicle type
TRUCK
GVWR
Class 8: 33,001 lb and above (14,969 kg and above)
Decoded at
Jul 30, 2026
vPIC returns make / model / year / body class / GVWR. Fields it does not resolve are shown as Not decoded rather than guessed.
02

Inspection history

Every roadside inspection of this VIN, newest first · Mar 20, 2024 – Feb 15, 2026

DateStateLevelViol.OOSCarrier (DOT)Plate
Feb 15, 2026IAII · Walk-around1OOS548937 ONTARIO LTD 510870PA78531/ON
Jun 14, 2025MAIII · Driver-only1—548937 ONTARIO LTD 510870PA78531/ON
Mar 20, 2024MIII · Walk-around1—CONTRANS FLATBED GROUP GP INC 1041297PA33028/ON
03

Carriers this unit has run under

2 distinct carriers · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
548937 ONTARIO LTD510870Jun 14, 2025Feb 15, 20262ON
CONTRANS FLATBED GROUP GP INC1041297Mar 20, 2024Mar 20, 20241ON
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.
PA78531ON—548937 ONTARIO LTDJun 14, 2025 → Feb 15, 20262
PA33028ON—CONTRANS FLATBED GROUP GP INCMar 20, 2024 → Mar 20, 20241
Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded Jul 30, 2026