Thranstor IV was a planet located somewhere in the space of the galaxy's Alpha or Beta Quadrants, the fourth planet in orbit of the Thranstor star system, at coordinates 4.97S 2.23W.

In the 23rd century, Thranstor IV was home to a Federation colony, a noted center of culture, industry, and trade. By reference stardate 2/2306.01, the world had a population of 4.26 billion individuals of various races and cultures, and the government was a full-status colonial member of the Federation. (FASA RPG module: The Federation)