Federal Communications Commission
http://www.fcc.gov

AM Broadcast Query by Call Sign or File No.
http://www.fcc.gov/mb/audio/amq.html

FM Broadcast Query by Call Sign or File No.
http://www.fcc.gov/mb/audio/fmq.html

TV Broadcast Query by Call Sign or File No.
http://www.fcc.gov/mb/video/tvq.html

National Telecommunications Information Administration
http://www.ntia.doc.gov

Federal Aviation Administration
http://www.faa.gov

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