11101111

11101111 is an eight-bit binary numeral commonly written as 11101111 or 0b11101111. In hexadecimal it corresponds to the byte EF. As an unsigned value, this binary sequence equals 239 in decimal. In an eight-bit signed representation using two's complement, it represents -17.

The byte is composed of two nibbles: the most significant nibble is 1110 (E) and the least significant nibble is 1111 (F). The pattern contains a single zero at the fourth position from the left, which makes it a useful example for illustrating bitwise operations. For instance, applying a bitwise AND with 0xEF (1110 1111) clears that specific bit while preserving the other bits.

In character encoding terms, 0xEF is the byte value that, in many 8-bit encodings such as ISO/IEC 8859-1, maps to the Unicode code point U+00EF, LATIN SMALL LETTER I WITH DIAERESIS (ï). ASCII, which is restricted to 7-bit values, does not define this byte.

Uses and contexts: 11101111 frequently appears in discussions of binary arithmetic, bitwise masking, and low-level data representation. As a byte, it serves as a canonical example in teaching materials and programming tutorials that demonstrate how different numeric interpretations (unsigned, signed, hexadecimal) relate to the same bit pattern.