1.1.4

Using Hexadecimal

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Using Hexadecimal

Hexadecimal is used in HTML to display colour on websites and to form unique MAC addresses for devices connected to a network.

HTML colours

HTML colours

  • In HTML, colours are defined by how much red, green and blue (RGB) there is on a scale of 0 to 255.
    • 0 to 255 is the range of numbers that can be represented as a single byte.
    • This means we use 2 hexadecimal digits to represent each RGB value.
  • HTML colour codes start with a hash symbol followed by 3 pairs of hexadecimal numbers like #00FF00.
HTML colours

HTML colours

  • We can break down the HTML colour code #00FF00 in the following way:
    • The red value is 00, which means we have 0 units of red.
    • The green value is FF, so we have 255 units of green.
    • The blue value is 00, so we have 0 units of blue.
  • The colour code #00FF00 corresponds to a bright green colour.
MAC addresses

MAC addresses

  • A MAC address is a number that uniquely identifies a networked device.
  • A MAC address is made up of 48 bits which are shown as 6 groups of 2 hexadecimal digits:
    • NN-NN-NN-DD-DD-DD or NN:NN:NN:DD:DD:DD
  • The first 6 hex digits identify the device manufacturer.
  • The second 6 hex digits identify the serial number of the device.
Jump to other topics
1

Computer Systems

1.1

Data Representation

1.1.1Binary Numbers1.1.2Negative Binary Numbers1.1.3Hexadecimal1.1.4Using Hexadecimal1.1.5Converting Binary & Hexadecimal1.1.6Converting Denary & Hexadecimal1.1.7Capacity1.1.8Calculating Capacity Requirements1.1.9Binary in Computer Systems1.1.10Data Compression1.1.11Run Length Encoding1.1.12File Formats
1.2

Data Transmission

1.2.1Packet Switching1.2.2Data Transmission1.2.3Universal Serial Bus (USB)1.2.4Parity Check1.2.5Checksum & Echo Checks1.2.6Encryption
1.3

Hardware

1.3.1Elements of Computer Systems1.3.2Types of Computer System1.3.3Von Neumann Architecture1.3.4The Fetch, Decode, Execute Cycle1.3.5Factors Affecting CPU Performance1.3.6Computational Logic1.3.7Input Devices1.3.82D & 3D Scanners1.3.9Code Readers1.3.10Solid State Storage1.3.11Magnetic Storage1.3.12Examples of Magnetic Storage1.3.13Optical Storage1.3.14Examples of Optical Storage1.3.15Types of Optical disk1.3.16Storage Requirements1.3.17Translation - Compilers1.3.18Translation - Interpreters1.3.19Translation - Assemblers1.3.20Acoustic Sensors1.3.21Flow Sensors1.3.22Gas Sensors1.3.23Humidity Sensors1.3.24Infrared Sensors1.3.25Level Sensors1.3.26Light Sensors1.3.27Magnetic Field Sensors1.3.28Moisture Sensors1.3.29pH Sensors1.3.30Pressure Sensors1.3.31Proximity Sensors1.3.32Temperature Sensors1.3.33Network Hardware
1.4

Software

1.4.1Operating Systems1.4.2Interrupts1.4.3High-Level Languages1.4.4Low-Level Languages
1.5

The Internet & its Uses

1.5.1The Internet1.5.2Uniform Resource Locators (URLs)1.5.3DNS1.5.4HTML1.5.5Cookies1.5.6Web Hosting1.5.7Digital Currency
1.6

Cyber Security

1.6.1Forms of Attack1.6.2Penetration Testing1.6.3Types of Malware1.6.4How Malware Spreads1.6.5Protecting Against Malware1.6.6Information Security1.6.7Structured Query Language (SQL) Injection1.6.8Firewalls1.6.9Authentication: User Access Levels1.6.10Authentication: Passwords1.6.11Social Engineering1.6.12Phishing1.6.13Denial of Service Attacks
1.7

Automated & Emerging Technologies

1.7.1Automated Systems1.7.2Robotics1.7.3Artificial Intelligence
2

Algorithms, Programming & Logic

2.1

Algorithm Design & Problem Solving

2.1.1Computational Thinking - Abstraction2.1.2Computational Thinking - Decomposition2.1.3Computational Thinking - Algorithmic Thinking2.1.4Pseudocode2.1.5Flow Diagrams2.1.6Interpreting, Correcting & Completing Algorithm2.1.7Correcting Algorithms2.1.8Completing Algorithms2.1.9Testing2.1.10Types of Testing2.1.11Test Plans2.1.12Validation & Sanitation2.1.13Authentication & Contingencies
2.2

Programming

2.2.1Programming Fundamentals - Variables & Constants2.2.2Programming Fundamentals - Comments2.2.3Programming Fundamentals - Input & Output2.2.4Data Types2.2.5Casting2.2.6Controlling Program Flow - Sequence2.2.7Controlling Program Flow - Selection2.2.8Controlling Program Flow - Iteration2.2.9Modularity - Subroutines2.2.10Modularity - Scope2.2.11Arrays
2.3

Databases

2.3.1Structuring Data - Records2.3.2Structuring Data - Databases2.3.3SQL
2.4

Boolean Logic

2.4.1Binary Systems2.4.2Logic Circuits2.4.3Truth Tables2.4.4Evaluating Expressions2.4.5Boolean Operators2.4.6End of Topic Test - Logic

Practice questions on Using Hexadecimal

Can you answer these? Test yourself with free interactive practice on Seneca — used by over 10 million students.

  1. 1
    Which of the following gives the manufacturer of a device with MAC address 6A:BB:17:5D:33:8F?Multiple choice
  2. 2
    Hexadecimal is commonly used by computer scientists, however a computer can only process binary data. What is the best description as to why it is commonly used by computer scientists?Multiple choice
  3. 3
    What is the binary representation of this MAC address: 83:8e:64:d3:5c:8e?Multiple choice
  4. 4
    What colour is represented by the hexadecimal value #FFFFFF?Multiple choice
  5. 5
    What colour is represented by the hexadecimal value #000000?Multiple choice
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Hexadecimal

Converting Binary & Hexadecimal