This $5,802,463.00 definitive, cost-plus-fixed-fee federal contract was awarded by the Defense Advanced Research Projects Agency (DARPA) to Peraton Labs Inc., doing business as Applied Communication Sciences, to perform research and development on the Extreme DDoS Defense (XD3) program. The XD3 program focuses on developing resilient defenses against distributed denial-of-service (DDoS) attacks on computer networks. Peraton Labs Inc. is the prime contractor, with the University of Maryland, College Park and George Mason University as major subcontractors. The contract supports Phase 1 and Phase 2 of the XD3 program, with a focus on reliable detection and mitigation of low-volume DDoS attacks. This contract does not have a set-aside designation. Peraton Labs Inc. is a subsidiary of Peraton Solutions Inc., which is a leading provider of IT services and advanced solutions to various U.S. government agencies.