Eighthexdigit

Eighthexdigit is an informal term used to describe a string of eight hexadecimal digits, using the symbols 0-9 and a-f (case-insensitive). Each hex digit encodes 4 bits, so eight digits represent 32 bits, i.e., a 32-bit value. The term is not part of formal standards but is widely understood in software development to denote a fixed-length hexadecimal representation.

In practice, eighthexdigit values appear as memory addresses on 32-bit systems, as identifiers in binary formats, or as color values with an alpha channel in some color specifications. For colors, an eight-digit hex code is used in RGBA form, written as #RRGGBBAA, for example #FFAA1122 indicates red=FF, green=AA, blue=11, alpha=22. In other contexts, eight-digit hex strings appear as CRC-32 checksums or other fixed-size numeric identifiers, often displayed as eight hex digits without a 0x prefix.

Formatting and parsing: Ambiguities can arise from case sensitivity, and some implementations require exactly eight digits, padding with leading zeros if necessary. When converting to a numeric type, programmers may specify unsigned 32-bit types to avoid negative values. In source code, hex literals are commonly written with a 0x prefix (e.g., 0x1A2B3C4D).

See also Hexadecimal numeral system; 32-bit integer; RGBA color model; CRC-32.