The APC-registered port most often seen in practice — PowerChute Business Edition agent traffic.
IANA registers 2161 to American Power Conversion (now Schneider Electric) as "APC 2161", with no protocol detail. Of APC's three registered ports it is the one that actually turned up on scans: PowerChute Business Edition agents on UPS-attached servers listened here for their management server. Schneider's current PowerChute port list documents TCP 6547 for the agent web UI and UDP 161 for SNMP, so 2161 marks an older install. Note the easy misread — this is not SNMP, which is 161.
Do not expose
Old UPS-shutdown agent software reachable from the network is a power-off control path; restrict it to a management VLAN and prefer a currently supported PowerChute release.
$ nc -vz TARGET 2161Seen 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.