Glossary
Unified Registration System (URS)
The Unified Registration System is FMCSA's long-running effort to consolidate how carriers, brokers, and freight forwarders register, moving from a scatter of legacy paper forms toward a single online process anchored on the USDOT number.
What it changes
Under the older system a company might juggle a USDOT number, one or more MC docket numbers, and separate filings that did not always line up. URS points toward the USDOT number as the single federal identifier and folds registration steps into one application. Rollout was staged and rescheduled for years. In May 2026 FMCSA moved registration to Motus, its new online system, and the MC number still appears on load boards and paperwork.
Why it matters for vetting
The direction of travel is that the USDOT number is the durable key to a company's federal record and the MC number is a legacy pointer that resolves to it. Anchoring your records on the USDOT number, rather than the MC number, keeps them aligned with where federal registration is heading. fleetfax accepts either number and resolves both to the same underlying USDOT record.
Related terms
USDOT number
The federal registration number every interstate carrier must hold. Every other federal record on the carrier is filed under it.
MC number
The legacy docket number tied to a carrier's operating authority. Every MC number points to a USDOT number; still the number most load boards display.
Operating authority
FMCSA's grant of legal permission to operate for hire: common, contract, or broker. Active, inactive, pending, revoked, and the gaps in between.
fleetfax reads public FMCSA data and is not affiliated with FMCSA or the U.S. Department of Transportation. This page explains terminology; it is not legal advice.