In Computing
- 128-bit key size encryption for secure communications over the Internet
- IPv6 uses 128-bit (16-byte) addresses
- Any bit with a binary prefix is 128 bytes of a lesser binary prefix value, such as 1 gibibit is 128 mebibytes
- 128-bit integers, memory addresses, or other data units are those that are at most 128 bits 16 octets wide
- ASCII includes definitions for 128 characters (33 non-printing characters, mostly obsolete control characters that affect how text is processed, and 94 printable)
- CAST-128 is a block cipher used in a number of products, notably as the default cipher in some versions of GPG and PGP.
- Graphics cards have a 128-bit or 256-bit data bus to memory.
- Atari 2600 consoles have 128 bytes of memory
- Sony's PlayStation 2 Emotion Engine CPU has two 128-bit vector units
- Macintosh 128K was the original Apple Macintosh personal computer released in 1984
- Laser 128 released by VTech was a clone of the Apple II released in 1984
- Commodore 128 home/personal computer which had a 128 KB of memory released in 1985
- Enterprise 128 Zilog Z80 home computer released in 1985
- Jane 128 was a GUI-based integrated software package for the Commodore 128 personal computer released in 1985
- RIVA 128 (Real-time Interactive Video and Animation accelerator) was one of the first consumer graphics chips to integrate 3D and video acceleration in 1997
- Super Mario 128 is a cancelled Nintendo game, though many elements were included in Super Mario Galaxy and Pikmin.
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