Internet TCP port 9 is primarily used for the Discard Protocol as defined by the Internet Engineering Task Force (IETF). This protocol is designed to discard any data it receives, often used for debugging, performance measurement, and/or network testing purposes. Additionally, port 9 is also used for the Wake-on-LAN (WoL) feature, which allows a network administrator to remotely power on a computer or to wake it up from sleep mode. However, it's important to note that these uses are not standard across all systems and software.
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