0x13

0x13 is a hexadecimal literal used in computing to denote the value 19 in decimal. The 0x prefix signals hexadecimal notation, so 0x13 equals binary 0001 0011 and decimal 19.

In ASCII and Unicode contexts, the byte value 0x13 corresponds to a non-printable control character: DC3 (Device Control 3). In Unicode the code point U+0013 represents the same control code.

In programming languages, 0x13 is commonly used as a literal for the integer 19. It appears in code for bitwise operations, masks, and small constants. The value is the same across languages that support hex literals, even though formatting and type rules may differ.

In networking, the decimal value 19 is assigned as the port number for the Chargen service (Character Generator Protocol) in TCP/UDP service registries. This association is historical and primarily of interest for context about how numeric values map to network services.