NetWorker's own portmapper, sitting next to nsrexecd on a backup client.
7938 carries what Nmap calls lgtomapper, the Legato/NetWorker portmapper that tells callers which dynamic port each NetWorker service is on — the same job Sun RPC's portmapper does on 111. It is unassigned at IANA and appears almost exclusively alongside 7937 on hosts running the NetWorker client. A scan showing 7937 and 7938 together is a reliable NetWorker fingerprint.
Do not expose
A portmapper enumerates the rest of the backup stack for whoever asks. Keep it inside the backup segment with the client daemon it serves.
$ nmap -sV -Pn -p 7937,7938 TARGETSeen 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.