An integration port for Netadmin, the Swedish OSS/BSS platform used by fibre and broadband operators.
IANA registers 3827 as netmpi, "Netadmin Systems MPI service", one of a small block the vendor holds alongside 3828 (neteh, event handler) and 3829 (neteh-ext). Netadmin Systems sells an operations- and business-support suite that fibre network operators use to provision subscribers and services, and these ports carry its internal component traffic rather than any subscriber-facing protocol. You will only see this inside a telco or municipal-network operator's management estate.
Do not expose
This is an operator's provisioning plane — it belongs on a management VLAN, never on an interface a subscriber or the internet can reach.
$ nc -vz TARGET 3827Seen 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.