How to Check a Carrier's DOT Number: The 7 Things Worth Reading (and the One Almost Nobody Checks)

Everyone checking a carrier does roughly the same thing: paste the USDOT number into SAFER, see the word ACTIVE, and move on.

That check answers one question — is this number switched on right now? It doesn't tell you whether the authority is one insurance filing away from being revoked, whether the fleet's vehicle out-of-service rate is nearly double the national average, or whether the "carrier" you're about to tender a load to has one truck and a name registered three weeks ago.

All of that is in FMCSA's public record. It's just spread across half a dozen different systems, and the single most useful part of it sits behind a reCAPTCHA that makes it practically unreadable.

This is what's worth reading, in the order it's worth reading it.

We also built a free tool that pulls all seven of these onto one page for any carrier: the DOT Checker — no signup, no card.

1. Is the USDOT number active, and is the authority separate from it?

These are two different registrations and they fail for different reasons. Carriers conflate them constantly.

• USDOT number — the identifier. It goes inactive mostly through administrative failure: a missed MCS-150 biennial update, most commonly.
• Operating authority (the MC number) — permission to haul regulated freight for hire across state lines. It's revoked for cause: insurance lapsing, or a failure to respond to FMCSA.

A carrier can hold an active USDOT number with a revoked authority. If you only check the first, everything looks fine.

A more detailed breakdown of which one a carrier actually needs is in MC Number vs DOT Number.

2. Insurance: what's required versus what's actually filed

This is the check that separates a real vetting process from a glance.

Most for-hire carriers must keep $750,000 minimum liability on file, filed by their insurer directly with FMCSA on a BMC-91 or BMC-91X (49 CFR Part 387). Household-goods and hazmat carriers sit higher.

The number that matters isn't the one on the certificate the carrier emailed you. It's the one on file at FMCSA, because that filing is what the authority is conditioned on. A certificate can be real while the federal filing behind it has already been cancelled.

So read two values side by side: required and on file. If they don't match, that's not a paperwork discrepancy — that's an authority with a countdown on it.

3. The signal almost nobody checks: the insurance filing history

Here's the one that's genuinely hard to get at, and the reason we built the tool.

When a carrier's insurer cancels a policy, the insurer files that cancellation with FMCSA. FMCSA doesn't revoke the authority the same day — it issues a notice, and the revocation follows. That gap is the entire warning. By the time SAFER flips the authority to revoked, the information that predicted it has been sitting in the public record for weeks.

Two things you can only see in the filing history, never in a current-status snapshot:

A cancellation with no replacement. Insurers file cancellations constantly as a routine part of switching carriers between policies — you'll see TERM/REPL (terminated and replaced) all over a healthy carrier's history, usually with a new filing the same day or within days. That's normal and means nothing. A straight cancellation with no replacement filing behind it is the one that ends in a revoked authority.

Insurer churn. Three insurers in thirteen months is legible as a pattern even when nothing has actually lapsed. Carriers that can't hold coverage usually can't hold it for a reason, and it tends to show up in the loss history before it shows up in the safety scores.

You'll also see the authority's own history here — INVOLUNTARY REVOCATION followed by DISCONTINUED REVOCATION means the carrier lost its authority and then got it back, typically by filing insurance again. One such cycle is a bad quarter. A repeating pattern of them is a carrier that operates permanently one missed premium from being shut down.

Why nobody looks: this lives in FMCSA's Licensing & Insurance system, and the L&I website sits behind a reCAPTCHA that makes it effectively unusable for routine checking. The data itself is public; the front door just isn't.

4. CSA BASICs — read the percentile, not the measure

FMCSA scores carriers in seven Behavior Analysis and Safety Improvement Categories. Each produces a measure (a raw number) and a percentile (a rank against carriers with a similar number of inspections).

The percentile is the one that means something. Measures aren't comparable across BASICs — different units, no published ceiling. A 1.10 in Hours-of-Service can be the 81st percentile while a 4.80 in Vehicle Maintenance is only the 44th. Higher percentile is worse.

The intervention thresholds aren't uniform:

Full detail on what happens after a carrier crosses one: CSA Score Thresholds and FMCSA Intervention.

A blank percentile is not a clean record. FMCSA only ranks a carrier in a BASIC once it has enough relevant inspections to rank it fairly; below that floor it publishes nothing at all. Small and new carriers are blank across most BASICs. That's an absence of data, not an absence of problems — and it's the single most common misreading of a CSA profile.

Two BASICs — Crash Indicator and Hazardous Materials — aren't published publicly at all. Blank there means blank for everyone.

5. Out-of-service rates, against the national average

A raw inspection count tells you how much a carrier runs, not how well. The rates are what to read, and they only mean something next to the national averages:

• Driver out-of-service rate — national average around 5.5%
• Vehicle out-of-service rate — national average around 22.2%

The vehicle number surprises people. Better than one in five vehicle inspections ending in an out-of-service order is normal. A carrier at 37% isn't catastrophic, but it's meaningfully worse than the field, and it's usually a maintenance-program problem rather than a driver problem.

6. The inspections themselves

Totals hide the shape of the thing. The individual inspection records show you where a carrier actually runs, how often it gets stopped, and — most usefully — the specific violation codes.

What to look for:

• Repeat violations of the same code. One brake violation is a bad day. The same code four times across eight months is a process that isn't working.
• Out-of-service violations specifically. These are the ones severe enough that an inspector stopped the truck or the driver from continuing. They weigh far more heavily in CSA than a form-and-manner write-up.
• Clean inspections. They count too, and a carrier with a long run of clean Level 1s has a genuinely different profile from one with the same violation count and half the inspections.

Worth knowing about the timing: FMCSA publishes the inspection within days, but the itemized violations behind it typically lag by six to eight weeks. A recent month that looks spotless may simply not have been written up yet.

7. Fleet size, and whether the record is internally consistent

The last check is a sanity check. Power units, driver count and the MCS-150 filing date come from the carrier's own biennial self-report.

Compare them against each other and against the inspection history. A carrier reporting 2 power units with 40 inspections in 24 months is running a lot more equipment than it's telling FMCSA. A carrier reporting 50 trucks with 3 inspections is either extraordinarily lucky or not running what it claims. An MCS-150 that hasn't been updated in three years means every number on the record is three years stale — and those numbers feed the CSA percentile calculation.

The one thing none of this tells you

Crash data. FMCSA publishes crash counts through an API that's gated and geographically restricted, so it isn't in the free public feeds — ours included. If crash history matters for your decision, you'll need to ask the carrier for it directly, or pull it through a paid service.

Being straight about that is the point: a vetting process is only as good as your knowledge of where its blind spots are.

Checking all seven at once

We pull these onto a single page for any US carrier, free and without an account: mycarriervault.com/dot-checker.

Search by USDOT number or by company name. You get carrier details and authority status, required-versus-filed insurance with the current insurer and policy, out-of-service rates against the national averages, all seven BASICs with measures and percentiles, recent roadside inspections with the violations on each, and the dated authority-and-insurance timeline from §3 — the part that's otherwise stuck behind the L&I reCAPTCHA.

Everything on it comes straight from FMCSA's published records. It's the federal record, laid out so it can be read — not our assessment of anybody.

If the carrier you're checking is your own: the same record a broker pulls on you is the one FMCSA reads, and it changes without telling you. MyCarrierVault watches your FMCSA record daily and emails you the day your authority status, insurance filings or CSA scores move — alongside driver qualification files, document expiry tracking and the rest of your compliance file in one place. Start a free 30-day trial — no credit card.