Port 4194 (spdm)

IANA assigns port 4194 to spdm: Security Protocol and Data Model.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

spdm TCP Security Protocol and Data Model DMTF Administration -

Registry dates for this port: registered 2022-01-10, last modified 2025-05-30.

Linux: is anything listening on TCP 4194?

sudo ss -tlnp 'sport = :4194'

Linux / macOS: which process owns the port

sudo lsof -nP -i :4194

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':4194 '

Windows (Command Prompt)

netstat -ano | findstr :4194

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4194 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 4194

From Windows

Test-NetConnection HOST -Port 4194

ufw

sudo ufw deny 4194/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 4194 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 4194 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 4194' -Direction Inbound -Protocol TCP -LocalPort 4194 -Action Block

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