Internet TCP port 19999 is primarily used by the DNP (Distributed Network Protocol), which is a set of communications protocols used between components in process automation systems. Its main use is in utilities such as electric and water companies. An example of software that uses this port is the DNP3 protocol, which is an open and standards-based communication protocol. It is robust and efficient, making it highly suitable for telemetry applications and it's often used in SCADA (Supervisory Control and Data Acquisition) systems.
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