Email this LII item:

Converting Between Binary, Decimal and Hexadecimal
This site "allows you to convert between binary, decimal, and hexadecimal [number] formats. For example, if you want to convert the decimal number 123 to binary and hex, simply type 123 in the textfield labeled decimal and then click the button to the right. The binary and hex values will be displayed in the corresponding textfields." From a computer science professor at Willamette University.
http://www.willamette.edu/~gorr/classes/cs130/lectures/BinaryConversion/convert.html

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