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Port 7471 (sttunnel)

IANA assigns port 7471 to sttunnel: Stateless Transport Tunneling Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sttunnel TCP Stateless Transport Tunneling Protocol Bruce Davie 3 -

Registry dates for this port: registered 2014-04-28.

Check what is listening on port 7471

Linux: is anything listening on TCP 7471?
sudo ss -tlnp 'sport = :7471'
Linux / macOS: which process owns the port
sudo lsof -nP -i :7471
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':7471 '
Windows (Command Prompt)
netstat -ano | findstr :7471
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 7471 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 7471
From Windows
Test-NetConnection HOST -Port 7471

Block port 7471 in the firewall

ufw
sudo ufw deny 7471/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 7471 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 7471 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 7471' -Direction Inbound -Protocol TCP -LocalPort 7471 -Action Block

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