Port 99872 services

2 entries are registered on port 9987. 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
udp · tcp

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
:9987TeamSpeak 3 Voicecaution
:9987DSM/SCM Target Interfacesafe

01TeamSpeak 3 Voiceudp · unofficial · risk 4/10

Port 9987 is primarily used as the default UDP port for TeamSpeak 3 servers, facilitating low-latency real-time voice communication for gaming and online communities. Voice packets transmitted over this port allow users to communicate clearly and efficiently during collaborative activities such as multiplayer gaming sessions, streaming coordination, and virtual conferencing.

port 9987 as TeamSpeak 3 Voice →

Which one is on your host

ask the machine, not the registry

The registry says what 9987 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 ':9987\b'
macos
lsof -nP -iTCP:9987 -sTCP:LISTEN
windows
netstat -ano | findstr :9987

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 9987 — 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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