00011111

00011111 is an eight-bit binary numeral consisting of three leading zeros followed by five ones. When interpreted as an unsigned binary number, it equals decimal 31. In hexadecimal it is 0x1F.

In computing, the pattern is commonly used as a bitmask that preserves the five least significant bits of a byte. For example, applying the mask 0x1F (00011111 in binary) to a value via bitwise AND yields a result in the range 0 to 31.

In the ASCII character encoding, the value 0x1F is the Unit Separator, a control code historically used to separate data units in streams rather than to represent printable text.

The five consecutive 1s also represent the maximum value of a five-bit field, a concept that appears in various encoding schemes and protocols that partition data into 5-bit units.

As a string of eight characters, "00011111" may appear in source code or data as a literal pattern; its numeric meaning depends on the base used to parse it (binary, decimal, or hexadecimal).