- 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 9750: Board M.I.T. Synchronous Collaboration
Port 9750 is assigned by IANA to board-voip (Board M.I.T. Synchronous Collaboration).
9750
How board-voip works
Voice & chatPort 9750 sets up the call (who calls whom), then the voice travels as a stream of audio packets.
- Transport
- TCP · 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 9750 dangerous?
We have no specific security note for port 9750. Its risk depends on the program actually listening on it. General advice for voice & chat services:
IANA registry entries for port 9750
| Service | Port | Transport | Description | Reference | Updated |
|---|---|---|---|---|---|
| board-voip | 9750 | TCP, UDP | Board M.I.T. Synchronous Collaboration | - | 2006-01 |
// source: IANA service name and port number registry
Which program uses port 9750, and is it reachable?
Linux
sudo ss -ltnup 'sport = :9750' # process listening on 9750
sudo lsof -nP -i :9750macOS
sudo lsof -nP -i :9750
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9750 -State Listen | Select LocalAddress, OwningProcess Get-NetUDPEndpoint -LocalPort 9750 netstat -ano | findstr :9750
From another machine
nmap -p 9750 -sV <host> sudo nmap -sU -p 9750 <host> nc -zv <host> 9750
Block it in the firewall
sudo ufw deny 9750/tcp # Linux (ufw) New-NetFirewallRule -DisplayName "Block 9750" -Direction Inbound -LocalPort 9750 -Protocol TCP -Action Block # Windows
What is port 9750 used for?
Port 9750 is assigned by IANA to board-voip (Board M.I.T. Synchronous Collaboration).
Is port 9750 TCP or UDP?
Port 9750 is registered for TCP and UDP.
Is it safe to open port 9750?
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 9750 is open?
On Linux run "ss -ltnup 'sport = :9750'", on macOS "lsof -nP -i :9750", and on Windows "netstat -ano | findstr :9750" to see the local process. From another machine, "nmap -p 9750 <host>" shows whether it is reachable.