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Number systems: where they are used in real life

6 min read

2026-02-28

Examples of using various number systems: from programming to network technologies and cryptography.

Where number systems are used

1. Web development: colors

Each CSS color in HEX is a hexadecimal number. #FF5733 = Red:255, Green:87, Blue:51.

2. Network technologies: IP and MAC

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IPv4 address 192.168.1.1 is 4 decimal octets

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MAC address AA:BB:CC:DD:EE:FF - hexadecimal pairs

3. Unix permissions

chmod 755 = rwxr-xr-x. Each digit is an octal representation of three bits (read, write, execute).

4. Low-level programming

Working with processor registers, bit masks, and flags requires binary and hexadecimal notation.

5. Cryptography and hashes

SHA-256 hashes are written in hexadecimal: 64 characters = 256 bits.

6. Character encoding

Unicode characters are specified in HEX: U+0041 = letter “A”, U+0410 = letter “A” (Cyrillic).

RegionMain system
Daily lifeDecimal
ProcessorsBinary
Web and networksHexadecimal
Unix rightsOctal

See also: Color converter, Data converter, Angle converter

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