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Port 4358 (qsnet-nucl)

IANA assigns port 4358 to qsnet-nucl: QSNet Nucleus.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
qsnet-nucl TCP QSNet Nucleus Neer Kleinman -
qsnet-nucl UDP QSNet Nucleus Neer Kleinman -

Check what is listening on port 4358

Linux: is anything listening on TCP 4358?
sudo ss -tlnp 'sport = :4358'
Linux: UDP 4358
sudo ss -ulnp 'sport = :4358'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4358
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4358 '
Windows (Command Prompt)
netstat -ano | findstr :4358
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4358 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4358
From Windows
Test-NetConnection HOST -Port 4358
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4358

Block port 4358 in the firewall

ufw
sudo ufw deny 4358/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4358 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4358 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4358' -Direction Inbound -Protocol TCP -LocalPort 4358 -Action Block
ufw
sudo ufw deny 4358/udp
iptables
sudo iptables -A INPUT -p udp --dport 4358 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4358 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4358' -Direction Inbound -Protocol UDP -LocalPort 4358 -Action Block

Related ports

4356qsnet-assist4357qsnet-cond4359omabcastltkm4360matrix-vnet, matrix_vnet

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