The Internet TCP port 9999 is commonly used by the Lantronix UDS-10/UDS100 (Universal Device Server) for device configuration. It is also utilized by the Hydran M2, a compact, permanently mounted monitoring system from GE, designed to monitor the condition of individual transformers. Additionally, the port is used by the Urchin Web Analytics software, a product of Google. However, it's important to note that this port can be used by any application configured to do so and is not exclusively reserved for these systems.
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