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Port 4169 (iadt, iadt-disc)

IANA assigns port 4169 to iadt, iadt-disc: Automation Drive Interface Transport.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
iadt TCP Automation Drive Interface Transport Paul Suhler -
iadt-disc UDP Internet ADT Discovery Protocol Paul A Suhler -

Registry dates for this port: registered 2008-02-15.

Check what is listening on port 4169

Linux: is anything listening on TCP 4169?
sudo ss -tlnp 'sport = :4169'
Linux: UDP 4169
sudo ss -ulnp 'sport = :4169'
Linux / macOS: which process owns the port
sudo lsof -nP -i :4169
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':4169 '
Windows (Command Prompt)
netstat -ano | findstr :4169
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 4169 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 4169
From Windows
Test-NetConnection HOST -Port 4169
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 4169

Block port 4169 in the firewall

ufw
sudo ufw deny 4169/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 4169 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 4169 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 4169' -Direction Inbound -Protocol TCP -LocalPort 4169 -Action Block
ufw
sudo ufw deny 4169/udp
iptables
sudo iptables -A INPUT -p udp --dport 4169 -j DROP
nftables
sudo nft add rule inet filter input udp dport 4169 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 4169' -Direction Inbound -Protocol UDP -LocalPort 4169 -Action Block

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