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Port 4411 (found)

IANA assigns port 4411 to found: Found Messaging Protocol.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
found TCP Found Messaging Protocol
Defined TXT keys: id, key Found Software -

Registry dates for this port: registered 2012-04-11.

Check what is listening on port 4411

Linux: is anything listening on TCP 4411?
sudo ss -tlnp 'sport = :4411'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4411
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4411 '
Windows (Command Prompt)
netstat -ano | findstr :4411
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4411 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4411
From Windows
Test-NetConnection HOST -Port 4411

Block port 4411 in the firewall

ufw
sudo ufw deny 4411/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4411 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4411 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4411' -Direction Inbound -Protocol TCP -LocalPort 4411 -Action Block

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