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A comprehensive list of the two-letter codes used by civil aircraft around the world, organized by country or region. Learn the meaning and history of each prefix, and how to identify the origin of an aircraft by its registration number.
DAFIF is a database of global aeronautical data, managed by the US National Geospatial-Intelligence Agency. It was publicly available until 2006, but is now restricted to authorized users due to intellectual property rights issues.
A web directory is a listing of websites organized in a hierarchy or interconnected list of categories. This page provides a list of notable web directory services, both general and niche, as well as some defunct directories.
A radar beacon (racon) is a device that returns a distinctive signal when triggered by a radar, providing range, bearing and identification information. Learn about the principle of operation, the characteristics, the applications and the proposal for enhanced RACON.
The search engine that helps you find exactly what you're looking for. Find the most relevant information, video, images, and answers from all across the Web. AOL.
A partial list of RFCs (request for comments memoranda) published by the Internet Engineering Task Force (IETF) and related bodies. RFCs are technical documents that define standards, protocols, and best practices for the Internet.
A web directory is a catalog of websites organized into categories and subcategories, created and maintained by human editors or automated methods. Learn about the history, scope, development, monetization and types of web directories, and how they differ from search engines.
A comprehensive list of websites that contain lists of chemicals, or databases of chemical information. The list covers various types of chemicals, properties, structures, sources, and applications, with links and brief descriptions.