0x404

0x404 is a hexadecimal numeral that represents the value 1028 in decimal. The prefix 0x denotes that the following digits are in base-16, so 0x404 equals 4×16² plus 0×16 plus 4, or 1024 plus 4, totaling 1028.

In computing, hex literals like 0x404 are commonly used for memory addresses, bit masks, and constants in source code, firmware, and debugging outputs. The exact meaning of 0x404 is context-dependent and can refer to any data value, flag, or address chosen by a programmer or system designer.

Because the digits in 0x404 resemble the decimal HTTP status code 404, there is an informal association in online culture between 0x404 and “Not Found.” However, this connection is casual and not a formal standard; 0x404 does not inherently encode an HTTP status concept.

Some software projects, tutorials, or communities may adopt the label 0x404 as a stylistic or mnemonic name, particularly in contexts dealing with hexadecimal notation or debugging topics. There is no single canonical entity universally identified as “0x404,” and its interpretation varies by context, language, and application.

See also: hexadecimal, 0x prefix, memory address, HTTP 404 Not Found, error codes.