Well known or Well-known is a phrase used in several technical contexts: *

Well-known ports This is a list of TCP and UDP port numbers used by protocols for operation of network applications. The Transmission Control Protocol (TCP) and the User Datagram Protocol (UDP) only need one port for bidirectional traffic. TCP usually uses port n ...

, port number in the range from 0 to 1023 *

Well-known text representation of coordinate reference systems Well-known text representation of coordinate reference systems (WKT or WKT-CRS) is a text markup language for representing spatial reference systems and transformations between spatial reference systems. The formats were originally defined by the ...

, text markup language for representing coordinate reference systems *

Well-known text representation of geometry Well-known text (WKT) is a text markup language for representing vector geometry objects. A binary equivalent, known as well-known binary (WKB), is used to transfer and store the same information in a more compact form convenient for computer proc ...

, text markup language for representing vector geometry objects * Well-known trade mark, a status granted to famous international trade marks *

Well-known URIs A well-known URI is a Uniform Resource Identifier for URL path prefixes that start with /.well-known/. They are implemented in webservers so that requests to the servers for well-known services or information are available at URLs consistent well- ...

, web services that use /.well-known/ URIs

See also