In computer networking, dot-decimal notation (also known as dotted quad notation [1]) is a method of writing down octet strings using base-10 (decimal) rather than hexadecimal numbers. Adding dots allows for easy separation of the individual octet values. For example, the hexadecimal octet string FF-00-00-00 can be expressed as 255.0.0.0 in dotted-decimal notation. IPv4 addresses are almost universally presented in dot-decimal notation. A similar notation is widely used in typography to number sections of documents (see ISO 2145).
