List of Falcon 9 first-stage boosters

A Falcon 9 first-stage booster is a reusable rocket booster used on the Falcon 9 and Falcon Heavy orbital launch vehicles manufactured by SpaceX. The manufacture of first-stage booster constitutes about 60% of the launch price of a single expended Falcon 9^[1] (and three of them over 80% of the launch price of an expended Falcon Heavy), which led SpaceX to develop a program dedicated to recovery and reuse of these boosters for a significant decrease in launch costs.^{[citation needed]} After multiple attempts, some as early as 2010, at controlling the re-entry of the first stage after its separation from the second stage, the first successful controlled landing of a first stage occurred on 22 December 2015, on the first flight of the Full Thrust version. Since then, Falcon 9 first-stage boosters have been landed and recovered 307 times out of 318 attempts, including synchronized recoveries of the side-boosters of most Falcon Heavy flights.

In total 42 recovered boosters have been refurbished and subsequently flown at least a second time, with a record of 20 missions and landings carried by a single booster. SpaceX intentionally limited Block 3 and Block 4 boosters to flying only two missions each,^[2][3] but the company indicated in 2018 that they expected the Block 5 versions to achieve ten flights, each with only minor refurbishment. This milestone was first achieved by Booster B1051 on the Starlink-27 mission in 2021.^[4]

All boosters in Block 4 and earlier have been retired, expended, or lost. The last flight of a Block 4 booster was in June 2018. Since then all boosters in the active fleet are Block 5.

Booster names are a B followed by a four-digit number. The first Falcon 9 version, v1.0, had boosters B0001 to B0007. All following boosters were numbered sequentially starting at B1001, the number 1 standing for first-stage booster.