The network of private-sector companies, organizations, and subcontractors that design, develop, manufacture, deliver, and maintain products and services for the U.S. Department of Defense (DoD). The DIB spans thousands of businesses of all sizes—ranging from large defense contractors to small and mid-sized suppliers—covering industries such as aerospace, manufacturing, construction, logistics, information technology, and professional services.

Because of its scale and strategic importance, the DIB is a constant target for cyberattacks from both criminal groups and nation-state actors. To safeguard sensitive government data, including Federal Contract Information (FCI) and Controlled Unclassified Information (CUI), the DoD requires DIB members to comply with cybersecurity standards like NIST SP 800-171, DFARS 252.204-7012, and the CMMC program.

Maintaining strong cybersecurity practices across the DIB is not only a contractual requirement but also a matter of national security, ensuring that critical defense capabilities are protected from compromise.