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Port 66992 services

2 entries are registered on port 6699. 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
1/2

entries encrypted on the wire

worst risk
4/10

1 of 2 iana-registered

Services on this port

ranked by lookups
portservicerisk
:6699WinMXcaution
:6699Babel Routing Protocol over DTLScaution

01WinMXtcp · unofficial · risk 4/10

WinMX was a peer-to-peer file sharing program popular in the early 2000s, used primarily for sharing audio files but capable of transferring various types of media and files. It operated over a decentralized network, employing multiple ports including 6699 for primary communication channels. The service facilitated connections between peer hosts to enable direct file exchanges, contributing to the growth of early internet file sharing culture.

port 6699 as WinMX →
filed underFile TransferMediaSecurityNetwork Services

Which one is on your host

ask the machine, not the registry

The registry says what 6699 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 ':6699\b'
macos
lsof -nP -iTCP:6699 -sTCP:LISTEN
windows
netstat -ano | findstr :6699

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 6699 — 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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