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Port 16462 services

2 entries are registered on port 1646. It is a registered port (1024–49151) — IANA records an assignee, but nothing stops other software from listening here, which is why the number carries more than one entry.

entries
2

services registered on this number

transport
tcp · udp

2 transports in use

in transit
0/2

entries encrypted on the wire

worst risk
4/10

1 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:1646RADIUS Accountingcaution
:1646sa-msg-portsafe

01RADIUS Accountingtcp · udp · unofficial · risk 4/10

Port 1646 is primarily used by RADIUS accounting services, often involving Cisco and Juniper Networks devices. It facilitates the transmission of user accounting information, enabling network administrators to track user activity, session statistics, and billing data. This port complements RADIUS authentication (usually on port 1812 or alternatives), ensuring comprehensive management of network access and resource utilization.

port 1646 as RADIUS Accounting →
filed underSecurityNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 1646 is registered to. What is listening on it right now is decided by the host, and only the host can be asked. Each of these prints the process behind the socket.

linux
ss -ltnp | grep ':1646\b'
macos
lsof -nP -iTCP:1646 -sTCP:LISTEN
windows
netstat -ano | findstr :1646

On Linux and Windows the process name comes back with the socket; on macOS lsof needs sudo to name a process that isn't yours. Match what it prints against the 2 entries above.

A port number is not a service. Anything may listen on 1646 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.

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