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Port 741 (netgw)

IANA assigns port 741 to netgw: netGW.

Well-known (system) port, 0-1023 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
netgw TCP netGW Oliver Korfmacher -
netgw UDP netGW Oliver Korfmacher -

Check what is listening on port 741

Linux: is anything listening on TCP 741?
sudo ss -tlnp 'sport = :741'
Linux: UDP 741
sudo ss -ulnp 'sport = :741'
Linux / macOS: which process owns the port
sudo lsof -nP -i :741
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':741 '
Windows (Command Prompt)
netstat -ano | findstr :741
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 741 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 741
From Windows
Test-NetConnection HOST -Port 741
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 741

Block port 741 in the firewall

ufw
sudo ufw deny 741/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 741 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 741 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 741' -Direction Inbound -Protocol TCP -LocalPort 741 -Action Block
ufw
sudo ufw deny 741/udp
iptables
sudo iptables -A INPUT -p udp --dport 741 -j DROP
nftables
sudo nft add rule inet filter input udp dport 741 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 741' -Direction Inbound -Protocol UDP -LocalPort 741 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.