A free master scanner frequencies list is available online at RadioReference.com, which offers a complete frequency database to registered users. Registration requires creating a username and password with a valid email address, then clicking on Database.
From the Database home page, click on one of the 50 states, or scroll down for a variety of search options including searching by locations such as state, metro area, city or ZIP code. Other search parameters include FCC data, trunked radio information and radio reports. In addition, users can search by identified frequencies that show who is using a known frequency. The Live Audio navigation menu opens Broadcastify.com, where users can listen to scanner frequencies live.