The USS Ranger (NCC-781) was the prototype of the Ranger-class explorer that was service with the Federation Starfleet during the 23rd century. (Ship Recognition Manual, Volume 4: Starships of the Original Series Era)

The sourcebook was written prior to Star Trek: Enterprise and claims the Ranger made first contact with the Klingons in 2218, where it was captured giving them warp technology, which now conflicts with canon.

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