On March 29, 2018, the FCC authorized SpaceX to provide broadband satellite internet services using the Ka and Ku bands. The Ka band is the range from 27-40GHz and the Ku band is 12-18GHz. Starlink also uses the V band, which is the range of 40-75GHz, as well as dipping into the X band and K band, which are the ranges of 8-12GHz and 18-27GHz respectively.
To be more specific, ranges from 10.7-12.7GHz and 37.5-42.5GHz are used for the transmission of data from Starlink satellites to the customer's terminal on the ground. The ranges from 17.8-18.6GHz, 18.8-19.3GHz, and 37.5-42.5GHz are used for satellite to gateway transmissions. Gateways are locations on the ground that can send and receive data from satellites to connect satellite internet users to the websites and other internet services that they wish to use. Transmissions from the customer's terminal back up to the satellites in orbit are handled in the ranges from 14-14.5GHz, 47.2-50.2GHz, and 50.4-51.4GHz. The ranges from 27.5-29.1GHz, 29.5-30GHz, 47.2-50.2GHz, and 50.4-51.4GHz are used to send information from the gateways back up to the satellites. Finally, the ranges used for tracking, telemetry and control are 12.15-12.25GHz, 18.55-18.6GHz, and 37.5-37.75GHz for downlink communications, and 13.85-14GHz and 47.2-47.45GHz for uplink communications.
For reference, here is a complete list of the ranges used:
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