MC Number Lookup
Free Motor Carrier (MC) number search with operating authority, insurance status, and trust score — backed by live FMCSA Licensing & Insurance data. Verify any for-hire carrier before you tender a load.
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What is an MC number?
An MC number — short for "Motor Carrier number" — is operating authority granted by the FMCSA. Where a USDOT number simply identifies a commercial motor carrier as registered, an MC number specifically authorizes that carrier to transport regulated goods or passengers across state lines for hire.
If a carrier hauls freight for someone other than themselves and crosses a state line, they need an MC number. Private carriers (companies hauling their own goods) and intrastate-only operators generally don't.
MC, FF, and MX prefixes
FMCSA actually issues three closely related authority types under the same numbering system:
MC-XXXXXX— Standard motor carrier of property or passengersFF-XXXXXX— Freight forwarder (broker without owning equipment)MX-XXXXXX— Mexican-domiciled motor carrier operating in the US
All three are operating authority and all three appear in our search. Most freight shippers and brokers will only encounter MC and (occasionally) MX.
How to check an MC number
MC number lookup takes about 30 seconds. Here's the four-step process:
Find the MC number
Look on the carrier's rate confirmation, freight invoice, BOL, or insurance certificate. The format is MC-123456 or MC 123456 — usually 4 to 7 digits.
Enter just the digits
On mclookup.com, type the numerical portion only — no MC prefix or hyphen. Hit search.
Review the carrier profile
You'll see the carrier's legal name, DOT number, fleet size, trust score, verdict, and complete authority + insurance history.
Confirm authority + insurance
Verify the MC authority is Active. Check insurance is in effect with adequate limits. Watch for any rejected insurance filings — a serious red flag.
Don't have an MC number? You can also search by company legal name or DOT number on MC Look Up. Try our DOT number lookup guide if you have a DOT instead.
MC number vs DOT number: what's the difference?
The two numbers serve different purposes. A USDOT number is a registration; an MC number is a permission. A carrier can have one without the other:
| USDOT Number | MC Number | |
|---|---|---|
| Issued by | FMCSA | FMCSA |
| Cost | Free | $300 (one-time) |
| Purpose | Identifies the carrier as a registered commercial vehicle operator | Grants operating authority for for-hire interstate transport |
| Required for | All commercial motor carriers (interstate or intrastate hazmat) | Only for-hire carriers transporting regulated goods or passengers across state lines |
| Insurance filing | Not required | Required (BMC-91 or BMC-91X) |
| Format | USDOT 1234567 |
MC-123456 |
In practice, most for-hire carriers have both. Private fleets (Walmart, Coca-Cola, etc. hauling their own goods) typically have only a USDOT. If you're booking with a for-hire carrier and they don't have an active MC, that's a stop sign.
What MC authority statuses mean
The most important field on any MC lookup is operating authority status. There are five common values:
Active — Authorized to operate
Authority is currently in effect, insurance is on file, and the carrier is permitted to haul for-hire interstate freight under this MC number. This is the only status under which booking is appropriate.
Pending — Application in process
The carrier has applied but FMCSA has not yet granted authority. Operating before approval is illegal. Pending is normal for new businesses but is a major risk flag for any established carrier — means their authority lapsed and they're trying to reinstate.
Inactive — Authority not currently in effect
The carrier had authority at one point but it's no longer active — usually because of expired insurance, missed registration updates, or voluntary suspension. The carrier cannot legally operate.
Revoked — Authority cancelled by FMCSA
FMCSA has formally revoked the MC. Common reasons: persistent safety violations, unpaid civil penalties, fraud, or operating while out-of-service. A revoked MC is one of our top REJECT signals.
Granted — Approved but not yet operating
FMCSA has granted authority but the carrier has not yet filed required insurance to activate it. Common for newly approved carriers. They cannot legally operate until insurance is filed and authority becomes Active.
Frequently asked questions
How do I check an MC number for free?
MC Look Up offers free MC number lookup with up to 50 searches per day on the free plan. The FMCSA Licensing & Insurance website (li-public.fmcsa.dot.gov) is also free but doesn't include scoring, insurance gap analysis, or chameleon detection — you'd have to cross-check across multiple FMCSA systems manually.
Can a carrier operate without an MC number?
Yes — if they're a private carrier (hauling their own freight), exempt commodity hauler, or intrastate-only operator. But any for-hire carrier transporting regulated goods or passengers across state lines must have an active MC. Operating for-hire interstate without one is a federal violation.
What's an FF or MX number?
Both are forms of FMCSA operating authority issued under the same numbering system. FF is freight forwarder authority — companies that arrange transportation but don't own equipment. MX is for Mexican-domiciled carriers operating in the United States. Both are searchable on MC Look Up the same way as a regular MC number.
How long does it take to get an MC number?
FMCSA's published target is 21 days from application to approval. In practice it can take 4 to 8 weeks depending on backlog and whether the carrier needs to file additional insurance or process agent paperwork. The MC is in Pending status during that window.
Why does an MC number return no results?
Either the number is invalid (typo or never existed), the carrier was deregistered before our records start, or the company holds FF or MX authority instead of standard MC. Try searching by DOT number or legal name instead, or cross-check the FMCSA L&I site.
Can I look up an MC number without signing up?
You'll need a free MC Look Up account to search (one-time email code, no password). This protects against scraping and lets us enforce fair-use limits. Free accounts get up to 50 searches per day.
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