The Internet TCP port 999 is commonly used by the Hydranode - edonkey2000 Client for peer-to-peer file sharing. It is also used by the Lantronix UDS-10/UDS100 RS-485 to Ethernet Converter for device networking. Additionally, the port is utilized by the ScimoreDB Database Server. However, it's important to note that these uses are not standardized and may vary depending on the specific software or system configuration.
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