0x8B

0x8B is a hexadecimal byte value commonly used in computing to represent the decimal number 139. The prefix 0x signals that the digits following it are in base 16. As a single byte, 0x8B can appear in memory or data streams, and its meaning depends on the context in which it is used.

In x86 machine code, 0x8B is an opcode that begins a MOV instruction, used to move data from a memory location or register into a 16- or 32-bit destination register. The full encoding includes additional bytes such as a ModR/M byte to specify the exact operands and may include displacement or a SIB byte for complex addressing. As such, 0x8B is a common value encountered in disassembly and reverse engineering of x86 binaries.

In terms of character encoding, 0x8B does not denote a standard printable ASCII character. In ISO/IEC 8859-1 (Latin-1) the byte 0x8B corresponds to a control code rather than a printable symbol. In Windows-1252 and related code pages, the interpretation of 0x8B varies by encoding, and it is typically not used as a common printable character. In UTF-8, a byte value of 0x8B cannot start a valid one-byte character and would function as a continuation byte within a multi-byte sequence if part of a valid larger encoding.

Endianness also affects interpretation when 0x8B is part of a larger multi-byte value; as a stand-alone byte, endianness does not alter its value, but the surrounding bytes determine the overall numeric interpretation.