The NDB Cluster management server (ndb_mgmd) — the control plane for MySQL Cluster, not a SQL port.
MySQL NDB Cluster splits into management nodes (ndb_mgmd), data nodes (ndbd/ndbmtd), and SQL nodes (mysqld). Data and SQL nodes find the management server at port 1186 by default, and the ndb_mgm admin client connects there to run cluster commands. It is not the MySQL client protocol — that stays on 3306. A host listening on 1186 is a MySQL Cluster management node, so 1186 open on a scan tells you a whole cluster is nearby.
Do not expose
The management protocol is the cluster's admin plane and is designed for a trusted private network; keep it on a cluster-internal interface, never on a public IP.
$ ndb_mgm -c TARGET:1186 -e showSeen this on your network? Beige Box scans your Wi-Fi and shows every open port on every device — and its Ports tool links straight back here.
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Corrections or a missing port? Reply @rimrocksystems.