Internet-Security.com TCP port 18080 details

Apache Spark History Server uses TCP port 18080 by default to serve its web UI for viewing completed application logs and metrics (common in standalone, YARN, and Kubernetes Spark deployments).
Monero (XMR) nodes use TCP port 18080 for the mainnet peer-to-peer protocol; the monerod daemon listens on this port to communicate with other nodes.
Exposed Spark History Servers on 18080 have been targeted in the wild (e.g., for information disclosure or as a foothold in cryptojacking/RCE campaigns against vulnerable Spark web UIs), so administrators often restrict or secure access to this port.

TCP 18080