The Spectrum Survey and Analysis Branch of the Spectrum Allocation Division of the Office of Chief Engineer within the Federal Communications Commission (FCC) has developed a computerized retrieval system for license information. This paper discusses this FORTRAN-based system which runs on the FCC's UNIVAC 1106 computer. The Master File Search (MFS) system contains over 1.2 million records covering all non-Government frequency assignments except for citizens and amateur licenses. The records contain technical information such as frequency, power, emission type(s), antenna height, station coordinates, etc., as well as some nontechnical information such as call sign, service code, class code, etc. The paper, by way of sample queries, demonstrates the utility of the system as an analytical tool helping the spectrum manager solve spectrum allocation problems. The paper also discusses the limitations of the system and examines some of the future enhancements which will be made to the MFS.