01Controller Pilot Data Link Communicationsctp · iana-registered · risk 6/10
SCTP port assignment for Controller Pilot Data Link Communication between aircraft and air traffic controllers.
port 5911 as Controller Pilot Data Link Communication →Port 59112 services
2 entries are registered on port 5911. 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
- transport
- sctp · tcp · udp
- in transit
- 0/2
- worst risk
- 6/10
services registered on this number
3 transports in use
entries encrypted on the wire
2 of 2 iana-registered
Services on this port
| port | service | risk | |||
|---|---|---|---|---|---|
| :5911 | Controller Pilot Data Link Communication | SCTP | — | risk | 0 |
| :5911 | Air Traffic Services ACARS | TCPUDP | Network Services | safe | 0 |
02Air Traffic Services ACARStcp · udp · iana-registered · risk 1/10
TCP and UDP port 5911 is assigned for Air Traffic Services applications using ACARS.
port 5911 as Air Traffic Services ACARS →filed underNetwork Services
Which one is on your host
The registry says what 5911 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 ':5911\b'- macos
lsof -nP -iTCP:5911 -sTCP:LISTEN- windows
netstat -ano | findstr :5911
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 5911 — what you actually met is decided by the host, not the registry. If a service is missing here, it belongs in the registry.
contribute an entry