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FAR Regulations Hierarchy

(Codification)
Using Part 52 as an example
Regulation Prefix Part Organization
Shield FAR   52 Federal Acquisition Regulation
Shield DFARS 2 52 Department of Defense
Shield HHSAR 3 52 Department of Health and Human Services
Shield AGAR 4 52 Department of Agriculture
Shield GSAM (GSAR) 5 52 General Services Administration
Shield DOSAR 6 52 Department of Statee
Shield AIDAR 7 52 Agency for International Development
Shield VAAR 8 52 Department of Veterans Affairs
Shield DEARS (DOE) 9 52 Department of Energy
Shield DTAR 10 52 Department of the Treasury
Shield TAR 12 52 Department of Transportation
Shield CAR 13 52 Department of Commerce
Shield DIAR 14 52 Department of the Interior
Shield EPAAR 15 52 Environmental Protection Agency
Shield FEHBAR 16 52 OPM, Federal Employees Health Benefits
OPM 17 52 Office of Personnel Management
Shield NFS (NASA) 18 52 National Aeronautics and Space Administration
Shield IAAR 19 52 Broadcasting Board of Governors
Shield NRCAR 20 52 Nuclear Regulatory Commission
Shield LIFAR 21 52 OPM, Federal Employees Group Life Insurance
SSA 23 52 Social Security Administration
Shield HUDAR 24 52 Department of Housing and Urban Development
NFSAR 25 52 National Science Foundation
Shield JAR 28 52 Department of Justice
Shield DOLAR 29 52 Department of Labor
Shield HSAR 30 52 Department of Homeland Security
Shield EDAR 34 52 Department of Education
ShieldAFARS (Army) 51 52 Department of the Army
Shield NMCARS (Navy Marines) 52 52 Department of Navy
Shield AFFARS (Air Force) 53 52 Department of Air Force
Shield DARS   52 Defense Information Systems Agency
Shield DLAD   52 Defense Logistics Agency
Shield USTRANSCOM 55 52 United States Transportation Command
Shield USSOCOM 56 52 United States Special Operations Command

For codification requirements see FAR 1.303 and DFAR 201.303

FAR - Federal Acquisition Regulation DFARS - Department of Defense AFARS - Department of the Army AFFARS - Department of Air Force DARS - Defense Information Systems Agency DLAD - Defense Logistics AgencyD NMCARS - Department of Navy SOFARS - United States Special Operations Command TRANSFARS - United States Transportation Command AGAR - Department of Agriculture AIDAR - Agency for International Development CAR - Department of Commerce DEARS - Department of Energy DIAR - Department of the Interior DOLAR - Department of Labor DOSAR - Department of State DTAR - Department of the Treasury EDAR - Department of Education EPAAR - Environmental Protection Agency FEHBAR - OPM, Federal Employees Group Life Insurance GSAM - General Services Administration HHSAR - Department of Health and Human Services HSAR - Department of Homeland Security HUDAR - Department of Housing and Urban Development IAAR - Broadcasting Board of Governors JAR - Department of Justice LIFAR - OPM, Federal Employees Group Life Insurance NFS - National Aeronautics and Space Administration NRCAR - Nuclear Regulatory Commission TAR - Department of Transportation VAAR - Department of Veterans Affairs