ooRexx's rxapi daemon — a local IPC broker that starts itself and quietly holds a socket open.
IANA assigns 10010/tcp to rxapi, the Open Object Rexx API daemon. It brokers queues, the macrospace, and registered external functions for ooRexx programs, and the interpreter starts it automatically the first time a script needs it — which is why it appears on machines nobody thinks of as ooRexx hosts. The matching UDP entry is Reserved. Nmap sees the port open on about 0.29% of scanned hosts, unusually high for a niche runtime service.
Do not expose
rxapi is designed as a local IPC broker between processes on one machine, not as a network service. If it is answering from off-box, bind it back to the loopback interface.
$ sudo lsof -nP -iTCP:10010 -sTCP:LISTENSeen 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.