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Port 43438 (hmip-routing)

IANA assigns port 43438 to hmip-routing: HmIP LAN Routing.

Registered (user) port, 1024-49151 UDP

Port 43438 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference
hmip-routing UDP HmIP LAN Routing eQ-3 Entwicklung GmbH -

Registry dates for this port: registered 2018-02-28.

Check what is listening on port 43438

Linux: UDP 43438
sudo ss -ulnp 'sport = :43438'
Linux / macOS: which process owns the port
sudo lsof -nP -i :43438
Windows (Command Prompt)
netstat -ano | findstr :43438
Windows (PowerShell)
Get-NetUDPEndpoint -LocalPort 43438

Test it from outside

UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 43438

Block port 43438 in the firewall

ufw
sudo ufw deny 43438/udp
iptables
sudo iptables -A INPUT -p udp --dport 43438 -j DROP
nftables
sudo nft add rule inet filter input udp dport 43438 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 43438' -Direction Inbound -Protocol UDP -LocalPort 43438 -Action Block

Related ports

43191noit-transport43210shaperai, shaperai-disc43439eq3-update, eq3-config43440ew-mgmt, ew-disc-cmd

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