0x4158

0x4158 is a 16‑bit hexadecimal number that equals 16728 in decimal notation. In ASCII, the two bytes 0x41 and 0x58 correspond to the capital letters 'A' and 'X', so the value can be read as the two–letter string “AX”. The hexadecimal notation is commonly used in computing to represent binary data in a compact form.

The combination 0x4158 appears in a few technical contexts. In the Windows operating system it has been used as a "magic number" in certain proprietary file formats and as a signature for specific types of resource files, indicating that the file contains data related to the AX series of components. In embedded and hardware design, 0x4158 may serve as an identifier for a particular device family or firmware version, allowing systems to verify compatibility. In some protocol specifications the value is used as a marker to delimit a block of data or to reference a control message tagged with the string “AX”.

Because the value translates directly to readable ASCII, it is also employed in debugging output and logging, where a developer might print 0x4158 to signify a checkpoint or to label a specific event group. The use of 0x4158 is generally limited to low‑level system code and device drivers, rather than in high‑level application logic.