The Falcon 9 launch vehicle lifted off from Vandenberg Space Force Base, California, at 8:55 p.m. local time (03:55 GMT) and deployed Starlink satellites, which was confirmed about 20 minutes after launch.
"Deployment of 51 Starlink satellites confirmed," the company announced on Twitter.
The first-stage booster successfully landed on the Of Course I Still Love You droneship.
Starlink is a next generation satellite network capable of providing broadband Internet access to the inhabitants of the Earth. The project began in February 2018. Its goal is to ensure access to high-speed Internet anywhere in the world.