FFFFFFFF

FFFFFFFF, written as eight hexadecimal F's, is commonly used in computing to denote the value 0xFFFFFFFF. In unsigned 32-bit representation this value equals 4,294,967,295. In signed 32-bit two's complement, all ones represents -1. The string is also used as a bit pattern with all bits set to 1 and can serve as a mask in bitwise operations.

In color formats, 0xFFFFFFFF may appear as a 32-bit ARGB or RGBA color value with full opacity and white color; for example, in ARGB 8888, A=FF, R=FF, G=FF, B=FF yields white. In CSS, hex colors are usually written without the 0x prefix and would be written as #FFFFFF.

In software development, the literal 0xFFFFFFFF is often used to indicate a special value such as an error code or sentinel value, depending on the language and context. In languages where int is signed by default, 0xFFFFFFFF is interpreted as -1; in unsigned contexts, it is the maximum unsigned value.

Variations include 0xFFFFFFFFFFFFFFFF for 64-bit values and 0xFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF for 128-bit patterns. The concept of all-bits-one is widely used in bitwise operations, cryptography (as a one-vector), and computer graphics.

References to 0xFFFFFFFF appear in documentation, discussions of integer limits, and examples illustrating overflow or masking behavior.