The agent-facing port of the LANrev endpoint management server — the product formerly sold as Absolute Manage.
IANA registers 3971 as lanrevserver. LANrev is client and asset management software: a server plus agents on Windows and macOS endpoints that inventory hardware and software, push packages, and run administrative tasks remotely. It has changed hands repeatedly — originally Pole Position Software's LANrev, sold as Absolute Manage, then HEAT LANrev, and latterly under Ivanti — and the registration is held by the original developer. A listener on 3971 is a management server for a fleet of managed desktops.
Do not expose
This server can install software and execute administrative tasks on every managed endpoint; reaching it from the internet is reaching the fleet. Publish nothing here and require a VPN for off-network agents.
$ nc -vz TARGET 3971Seen 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.