48 C.F.R. § 13.102
(a) Contracting officers should use the System for Award Management (see subpart 4.11) via https://www.sam.gov as their primary sources of vendor information. Offices maintaining additional vendor source files or listings should identify the status of each source (when the status is made known to the contracting office) in the following categories:
[62 FR 64917, Dec. 9, 1997, as amended at 63 FR 58593, Oct. 30, 1998; 68 FR 56673, Oct. 1, 2003; 76 FR 18308, Apr. 1, 2011; 77 FR 188, Jan. 3, 2012; 78 FR 37678, June 21, 2013; 79 FR 43582, July 25, 2014; 83 FR 48697, Sept. 26, 2018]