Dot-decimal notation
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In computer networking, dot-decimal notation 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 written or typed in dot-decimal notation.
A similar notation is widely used in typography to number sections of documents (see ISO 2145).