Internet TCP port 8091 is commonly used by Couchbase, an open-source, distributed, multi-model NoSQL document-oriented database software package. It is also used by Apache Cassandra, a free and open-source distributed wide column store NoSQL database management system. Additionally, it is utilized by the Splunk Universal Forwarder, which is a service that sends data to Splunk Enterprise or Splunk Cloud instances. This port is not officially associated with any specific service and its use may vary depending on the application.
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