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Port 4354 (qsnet-trans)

IANA assigns port 4354 to qsnet-trans: QSNet Transmitter.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qsnet-trans TCP QSNet Transmitter - -
qsnet-trans UDP QSNet Transmitter - -

Check what is listening on port 4354

Linux: is anything listening on TCP 4354?
sudo ss -tlnp 'sport = :4354'
Linux: UDP 4354
sudo ss -ulnp 'sport = :4354'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4354
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4354 '
Windows (Command Prompt)
netstat -ano | findstr :4354
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4354 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4354
From Windows
Test-NetConnection HOST -Port 4354
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4354

Block port 4354 in the firewall

ufw
sudo ufw deny 4354/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4354 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4354 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4354' -Direction Inbound -Protocol TCP -LocalPort 4354 -Action Block
ufw
sudo ufw deny 4354/udp
iptables
sudo iptables -A INPUT -p udp --dport 4354 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4354 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4354' -Direction Inbound -Protocol UDP -LocalPort 4354 -Action Block

Related ports

4352pjlink4353f5-iquery4355qsnet-workst4356qsnet-assist

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