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Port 1165 (qsm-gui)

IANA assigns port 1165 to qsm-gui: QSM GUI Service.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qsm-gui TCP QSM GUI Service Norm Lunde -
qsm-gui UDP QSM GUI Service Norm Lunde -

Registry dates for this port: registered 2004-11.

Check what is listening on port 1165

Linux: is anything listening on TCP 1165?
sudo ss -tlnp 'sport = :1165'
Linux: UDP 1165
sudo ss -ulnp 'sport = :1165'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1165
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1165 '
Windows (Command Prompt)
netstat -ano | findstr :1165
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1165 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1165
From Windows
Test-NetConnection HOST -Port 1165
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1165

Block port 1165 in the firewall

ufw
sudo ufw deny 1165/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1165 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1165 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1165' -Direction Inbound -Protocol TCP -LocalPort 1165 -Action Block
ufw
sudo ufw deny 1165/udp
iptables
sudo iptables -A INPUT -p udp --dport 1165 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1165 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1165' -Direction Inbound -Protocol UDP -LocalPort 1165 -Action Block

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