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1. URS (Unified Registration System): This is the FMCSA’s online platform for obtaining and updating your USDOT number and, if needed, your Operating Authority (MC Number). Essentially, URS is about applying for and managing your official federal registration to operate as a carrier, broker, or freight forwarder.
2. UCR (Unified Carrier Registration): An annual fee-based program that most interstate carriers and brokers must pay into. It’s separate from getting your DOT or MC number—think of it as a yearly safety and enforcement fund.

In short, URS gives you your authority credentials, while UCR is a yearly compliance fee requirement once you have that authority.