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Summary Use of Hexadecimal System
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This document includes and explains the examples of using the hexadecimal system in computer science.
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1.1.3 Use of the hexadecimal system -> more convenient to use as 1 hex digit = 4 hex digitse.g. Error codes:
- automatically generated by the computer
- refer to the memory location of the error
Media Access Control (MAC) addresses:
- made up of 48 bits (6 groups of 2 hex digits), e.g. NN-NN-NN-DD-DD-DD (N: identify no. of manufacturer)
- uniquely identify a device (D: serial no. of device)
- rarely changed so that a particular device can always be identified no matter where it is
Internet Protocol (IP) addresses:
- uniquely identify every device’s location on a network
- IPv4: 32 bits, e.g. 109.108.158.1 (denary)/77.76.9e.01 (hex)
- IPv6: 128 bits, e.g. a8fb:7a88:fff0:3d21:2085:66fb:f0fa <- broken down into 16-bit chunks
HyperText Mark-up Language (HTML) colour codes:
- made up of different combinations of the three primary colours (rgb)
- the different intensity of each colour (rgb) is determined by its hexadecimal value
- red: #FF0000/green: #00FF00/blue: #0000FF
- 256^3 possible colours in total
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