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Port 3841 (shiprush-db-svr)

IANA assigns port 3841 to shiprush-db-svr: ShipRush Database Server.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
shiprush-db-svr TCP ShipRush Database Server Z-Firm LLC -

Registry dates for this port: registered 2003-11, last modified 2014-08-22.

Check what is listening on port 3841

Linux: is anything listening on TCP 3841?
sudo ss -tlnp 'sport = :3841'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3841
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3841 '
Windows (Command Prompt)
netstat -ano | findstr :3841
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3841 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3841
From Windows
Test-NetConnection HOST -Port 3841

Block port 3841 in the firewall

ufw
sudo ufw deny 3841/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3841 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3841 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3841' -Direction Inbound -Protocol TCP -LocalPort 3841 -Action Block

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