0x123

0x123 is a hexadecimal literal commonly used in programming and computing to denote a numeric value. The prefix 0x signals that the following digits are in base-16 rather than decimal.

In most languages such as C, C++, Java, JavaScript, and Python, 0x123 is interpreted as the unsigned integer 291. It can appear as a constant, an offset, a bit mask, or an address offset in examples and code.

In practice, 0x123 often appears in memory dumps, debugging outputs, or tutorials as a small, simple value. It is not by itself a full memory address; actual addresses are typically longer and context-dependent.

The notation is also used in some contexts for color or data encodings, but a stand-alone 0x123 is not a conventional color value in web formats. It is not an IP address, as IPs use dotted decimal or IPv6 notation.

See also: hexadecimal notation, 0x prefix, integer literal, memory address, hex dump.