Key facts
- Curbstoning = an unlicensed seller who buys cars (often salvage, junk-auction, or flood vehicles) and resells them fast while posing as a private, one-owner party.
- Odometer rollback: ~2.45 million U.S. vehicles suspected, up 14% year over year, averaging ~$3,300 in lost value to the buyer — CARFAX, December 16, 2025.
- Flood/water damage: ~482,000 water-damaged vehicles estimated back on U.S. roads at the start of 2025, plus up to 45,000 more from mid-2025 storms — CARFAX.
- The "80%" claim: "Up to 80% of online classified used cars come from curbstoners" is an unverified industry estimate attributed to "experts," with no traceable primary study — not a Zilocar figure.
- Dealer-license thresholds vary by state: Florida ~2 sales/year, California and Minnesota more than 5, New Jersey/North Dakota/Oklahoma effectively 0; the federal FTC Used Car Rule requires a Buyers Guide at 6+ vehicles/year.
- What a VIN reveals: sales-listing history, junk/salvage-auction records, odometer, ownership, and accident/damage — the mismatch between the seller's story and the record.
What is curbstoning, and why is it illegal?
Curbstoning is the practice of an unlicensed seller buying used cars and reselling them quickly while pretending to be a private, one-owner party. By posing as a private seller, the curbstoner sidesteps dealer-licensing requirements, disclosure obligations, and consumer-protection rules that a licensed dealer must follow. The cars are frequently sourced from salvage, junk, or flood auctions, then cleaned up and relisted at a markup.
Legality varies by state, so this is not legal advice. At the federal level, the FTC Used Car Rule requires a Buyers Guide window sticker for anyone selling 6 or more used vehicles in a 12-month period. State dealer-license thresholds are far lower and differ widely — which is exactly the gap curbstoners exploit.
Why used-car scams are harder to spot right now
A syndicated feature that ran across local outlets in late July and early August 2026 highlighted why used-car scams are harder to catch today, citing CARFAX figures on rolled-back odometers and water-damaged vehicles back on the road. The underlying numbers are real, but they carry specific dates worth stating precisely.
CARFAX estimated 2.45 million U.S. vehicles suspected of odometer rollback as of its December 16, 2025 release — a 14% jump year over year (up from a 4% increase the prior year), costing an average buyer roughly $3,300 in value. The largest state increases were Montana (+33%), Tennessee (+30%), Arkansas (+28%), Oklahoma (+25%), Kansas (+24%), New Jersey (+21%), and Florida (+20%). Separately, CARFAX estimated about 482,000 water-damaged vehicles were back in service at the start of 2025 — led by Florida (~82,000), Texas (~63,000), and Kentucky (~32,000) — with up to 45,000 more flooded in mid-2025 storms. CARFAX repeatedly warns that flood cars migrate out of storm states into non-obvious markets like Pennsylvania and Illinois.
The used-car scam landscape at a glance
| Scam | Scale (U.S.) | Source & date | What it means for a buyer |
|---|---|---|---|
| Odometer rollback | ~2.45M suspected; +14% YoY; ~$3,300 avg loss | CARFAX, Dec 16, 2025 | Mileage altered in the car's electronic modules |
| Flood / water damage | ~482,000 on road at start of 2025; +up to 45,000 from mid-2025 storms | CARFAX, Aug 7, 2025 | Dried-out flood cars relisted, often out of storm states |
| Curbstoning (online classifieds) | "Up to 80%" of online classified used cars (unverified estimate) | "Experts say," via eTags/Stacker/Zebra | Unlicensed flipper posing as a private one-owner seller |
The "up to 80%" curbstoning figure is repeated across consumer and syndicated content but has no traceable primary study or methodology; treat it as an industry estimate, not established fact.
How can I tell if a "private seller" is actually an unlicensed dealer?
Read the timeline and the contact details, not just the ad copy. The strongest tell is a mismatch between a seller's "private, one-owner" story and a paper trail showing the car was bought days ago at auction or listed repeatedly under different names and prices. Classic curbstoner signals include the same phone number appearing on multiple listings, a seller who answers the phone with "which car?", a title that is not in the seller's name, "lost title" excuses, and pressure to close fast.
The table below maps each listing red flag to what a vehicle history can show and the corresponding field in a vehicle-history report.
| Red flag in the listing/seller | What the VIN history reveals | Report field |
|---|---|---|
| "Private, one-owner" but bought days ago | Rapid auction-to-listing turnaround | Salvage/junk-auction records + sales-listing dates |
| Same phone/car on several ads, different prices | Multiple recent listings under different sellers/prices | Sales-listing history (prices, mileage, days-on-market) |
| Title not in seller's name / "lost title" | Ownership never transferred; owner count | Ownership history |
| Suspiciously low mileage | Mileage decreasing between records | Odometer / rollback check |
| Car looks clean, smells "new" | Prior salvage/junk auction or damage record | Junk & salvage-auction records; accident/damage records |
| Priced below market | Valuation gap | Market valuation |
How many cars can someone sell before needing a dealer license?
It depends entirely on your state, so confirm the current number with your DMV. As an illustration of how wide the range is: Florida can trigger a dealer-license requirement at just 2 sales in 12 months; California and Minnesota require a license above 5 sales a year; and New Jersey, North Dakota, and Oklahoma effectively permit zero unlicensed sales. The federal FTC Used Car Rule sits on top of these, requiring a Buyers Guide window sticker for anyone selling 6 or more used vehicles in a year.
| State | Unlicensed sales allowed / 12 months |
|---|---|
| Florida | 2 |
| California | up to 5 (license required above 5) |
| Minnesota | up to 5 (above 5 = dealing) |
| New Jersey / North Dakota / Oklahoma | effectively 0 |
| FTC Used Car Rule (federal Buyers Guide) | applies at 6+ |
Thresholds above are illustrative summaries and vary by state; exact statutory numbers change — check your DMV rather than treating this as legal advice.
Title jumping vs. title washing: how are they different?
These are two distinct frauds that often travel with curbstoning. Title jumping is failing to transfer a title into your own name after buying a car — a curbstoner buys at auction and flips the vehicle without ever registering it, so the paperwork skips an owner. Title washing is moving a car through a lenient state to strip a salvage or flood brand off the title, hiding the car's damage past.
Both leave gaps a buyer can notice: an ownership record that never shows the current seller, or auction and damage records that don't match a "clean" title claim.
What a VIN check can and can't tell you here
A VIN check is the counter-tool for curbstoning specifically because a flip leaves a paper trail the seller cannot easily erase. Here is the honest boundary.
A VIN check CAN surface:
- Sales-listing history — past and current listings, prices, mileage, and days-on-market. This is the strongest signal for curbstoning: it exposes rapid auction-to-listing turnaround and the same car relisted under different sellers or prices.
- Junk & salvage-auction records — showing a car passed through auctions a seller calls a "clean one-owner."
- Odometer / rollback check, ownership history, and accident & damage records (location, type, severity, airbag-deployment status).
- Theft (NICB), specs and options, NHTSA and IIHS safety ratings, market valuation, and recall presence/count (like NHTSA's free tool).
A VIN check CANNOT:
- Prove a car was "curbstoned," "title-washed," or "laundered" — those are legal or behavioral conclusions the buyer draws from the timeline.
- Show the legal title-brand classification — it surfaces junk/salvage auction records, not the state's official title brand.
- Confirm whether a recall was remedied or flashed, flag NHTSA investigations (PE/EA), or show per-unit dealer firmware status. For remedy and investigation status, use NHTSA's free VIN lookup and your dealer.
The value here is timeline-reading: a VIN check lets you catch the mismatch between the seller's story and the record. The final judgment is yours.
How to check an online listing before you buy
- Start with the free authoritative tools. Run the VIN through NHTSA's free recall lookup at nhtsa.gov/recalls, and check flood exposure with a free flood tool such as carfax.com/flood.
- Pull the vehicle's history and read the dates. Look for rapid auction-to-listing turnaround, prior salvage/junk-auction records, decreasing odometer readings, and the same car relisted under different sellers or prices. A Zilocar VIN check is one option here alongside the free tools, because its sales-listing history and salvage/junk-auction records are built to expose exactly this timeline.
- Test the seller against the record. Confirm the title is in the seller's name, that the mileage matches, and that the "private, one-owner" claim survives the paper trail.
