ADS-B Traffic Simulator is a software that allows definition of ADS-B traffic scenarios consisting of up to 1000 aircraft. A standard compliant set of ADS-B messages consisting of position, velocity and status messages are generated for MOPS categories 0, 1, 2. Functions allow automatic animations like flying in circles or along vectors. The messages are generated on a network stream to be fed into the visualization or ASTERIX generation software. Additionally it can be fed to the AVIONIX SSR Message Generator to generate a real RF scenario for load tests.