NASA/NSSC intends to issue a sole source contract to Zayo Group LLC for FY26 Zayo Dark Fiber Renewal, as they are determined to be the sole provider. Performance will be located at NASA's Goddard Space Flight Center (GSFC). Interested organizations may submit their capabilities and qualifications in writing by 4:00 a.m. Central Standard Time on June 3, 2026, for evaluation to determine if competition is possible. No budget amount is specified in the description. This is a commercial item procurement under FAR Part 12.