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Learn about the different types and examples of police codes used in the United States, such as 10 codes, signals, incident codes, and response codes. See how codes vary by state, county, and agency, and how they are related to the California Penal Code.
Learn about the geographic and non-geographic area codes used in the North American Numbering Plan (NANP), which divides the territories of its members into numbering plan areas (NPAs). See the numerical order, date, territory or use, and notes of each area code.
Learn about the identifiers assigned to radio and TV stations by the FCC and NTIA, and how they reflect slogans, owners, locations, and numbers. Find out which stations have the same call letters for 100 years or more, and which ones have changed many times.
Learn how FM stations are assigned channel numbers from 200 to 300 in the frequency range from 87.8 to 108.0 MHz in the Americas. See the complete list of channel numbers and frequencies for FM broadcasting in ITU region 2.
Ten-codes are abbreviated phrases used by public safety officials and CB radio enthusiasts to communicate quickly and clearly. Learn about the history, meaning and usage of ten-codes, such as 10-4 (understood), 10-33 (officer needs help) and 10-7 (out of service).
Learn about the history and usage of different emergency numbers around the world, such as 911, 112, and 999. Find out how they are configured and operated, and how they can provide location information and dispatch services.
Learn about the history and usage of the International Code of Signals, a system of flags and codes for maritime communication. The code includes a standardized alphabet and numerals, as well as messages for safety of navigation and related matters.
Find the area codes for different regions or countries in North America, including the original NANP and other autonomous plans. Learn how to format and dial telephone numbers in Mexico, Greenland, and Saint Pierre and Miquelon.