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Port 43191 (noit-transport)

IANA assigns port 43191 to noit-transport: Reconnoiter Agent Data Transport.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
noit-transport TCP Reconnoiter Agent Data Transport Theo Schlossnagle -

Registry dates for this port: registered 2009-05-19.

Check what is listening on port 43191

Linux: is anything listening on TCP 43191?
sudo ss -tlnp 'sport = :43191'
Linux / macOS: which process owns the port
sudo lsof -nP -i :43191
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':43191 '
Windows (Command Prompt)
netstat -ano | findstr :43191
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 43191 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 43191
From Windows
Test-NetConnection HOST -Port 43191

Block port 43191 in the firewall

ufw
sudo ufw deny 43191/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 43191 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 43191 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 43191' -Direction Inbound -Protocol TCP -LocalPort 43191 -Action Block

Related ports

43189ndm-agent-port43190ip-provision43210shaperai, shaperai-disc43438hmip-routing

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