www.deanumber.com

"The products advertised on this Web site contain the complete official DEA database of persons and organizations certified to handle controlled substances under the Controlled Substances Act. DEA authorizes the use of this database, and the inclusion of any individual or organization in the database, as proof of that entity's registration with the DEA."

http://www.ssdmf.com

"The Death Master File (DMF) from the Social Security Administration (SSA) contains over 65 million records created from SSA payment records."

http://www.npinum.com

"The NPI Registry enables you to search for a provider's NPPES information."