The Masgen system existed within the Churnis sector, which itself was a component of the New Territories region found in the Mid Rim. Its location on the Namadii Corridor hyperlane placed it in the space between the Ansion and Kalaan systems.
Qatak Qantaras, a Tarro operative who sided with the Rebel Alliance, was active in the Masgen system during the time of the Galactic Civil War. In the years 12 ABY to 13 ABY, the New Republic claimed the system as part of its territory.
Craig Robert Carey conceived of the Masgen system, and it initially appeared in Galaxy Guide 12: Aliens — Enemies and Allies, a 1995 resource published by West End Games for their Star Wars: The Roleplaying Game. The 2009 book titled The Essential Atlas pinpointed its location as grid I-7.