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Port 9750 (board-voip)

IANA assigns port 9750 to board-voip: Board M.I.T. Synchronous Collaboration.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
board-voip TCP Board M.I.T. Synchronous Collaboration Francesco Rosi -
board-voip UDP Board M.I.T. Synchronous Collaboration Francesco Rosi -

Registry dates for this port: registered 2006-01.

Check what is listening on port 9750

Linux: is anything listening on TCP 9750?
sudo ss -tlnp 'sport = :9750'
Linux: UDP 9750
sudo ss -ulnp 'sport = :9750'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9750
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9750 '
Windows (Command Prompt)
netstat -ano | findstr :9750
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9750 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9750
From Windows
Test-NetConnection HOST -Port 9750
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9750

Block port 9750 in the firewall

ufw
sudo ufw deny 9750/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9750 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9750 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9750' -Direction Inbound -Protocol TCP -LocalPort 9750 -Action Block
ufw
sudo ufw deny 9750/udp
iptables
sudo iptables -A INPUT -p udp --dport 9750 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9750 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9750' -Direction Inbound -Protocol UDP -LocalPort 9750 -Action Block

Related ports

9700board-roar9747l5nas-parchan9753rasadv9762tungsten-http

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.