Prefix code

The prefix code is a code that is assigned to every Starfleet vessel. These unique codes are primarily designed as a defensive measure so that Starfleet forces can gain control of any of their vessels that have been captured by hostile forces.

In 2373 the USS Swiftfire-A used the prefix code of the USS Fury to disable that ship's shields, weapons and engines after the vessel went rogue and was about to attack a Klingon civilian colony. (: "Vengeance")

Some shuttlecraft also had prefix codes. At the end of 2374 in an effort to find a missing shuttle the Swiftfire-A used the subspace relay network to transmit a blanket signal throughout a large search area. The transmission included the prefix code and the command for the shuttle to send a return signal to the Swiftfire. (: "Crossfire")