- Use strong credentials and TLS for signalling.
- Rate-limit registrations to stop extension scanning and toll fraud.
- Alert on unexpected chat protocols leaving servers (possible command and control).
Port 9011: D-Star Routing digital voice+data for amateur radio
Port 9011 is assigned by IANA to d-star (D-Star Routing digital voice+data for amateur radio).
9011
How d-star works
Voice & chatPort 9011 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- Transport
- UDP
- Exposure risk
- not rated depends on the program listening
- Encryption
- Unknownnot stated by the registry
- IANA status
- Assigned1 registered service
- Range
- Registered (1024-49151)
- Category
- Voice & chat
Is port 9011 dangerous?
We have no specific security note for port 9011. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 9011
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| d-star | 9011 | UDP | D-Star Routing digital voice+data for amateur radio | - | 2018-03-16 |
| - | 9011 | - | Reserved | - | - |
// source: IANA service name and port number registry
Which program uses port 9011, and is it reachable?
Linux
sudo ss -ltnup 'sport = :9011' # process listening on 9011
sudo lsof -nP -i :9011macOS
sudo lsof -nP -i :9011
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9011 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 9011 netstat -ano | findstr :9011
From another machine
nmap -p 9011 -sV <host> sudo nmap -sU -p 9011 <host> nc -zv <host> 9011
Block it in the firewall
sudo ufw deny 9011/udp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 9011" -Direction Inbound -LocalPort 9011 -Protocol UDP -Action Block # Windows
What is port 9011 used for?
Port 9011 is assigned by IANA to d-star (D-Star Routing digital voice+data for amateur radio).
Is port 9011 TCP or UDP?
Port 9011 is registered for UDP.
Is it safe to open port 9011?
It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Use strong credentials and TLS for signalling.
How do I check if port 9011 is open?
On Linux run "ss -ltnup 'sport = :9011'", on macOS "lsof -nP -i :9011", and on Windows "netstat -ano | findstr :9011" to see the local process. From another machine, "nmap -p 9011 <host>" shows whether it is reachable.