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// Network services

Port 43438: HmIP LAN Routing

Port 43438 is assigned by IANA to hmip-routing (HmIP LAN Routing).

43438

How hmip-routing works

Network services
client:43438hmip-routingresponse client:43438hmip-routingresponse

The client sends a request to port 43438 and the hmip-routing service answers.

Transport
UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Network services
01 Security

Is port 43438 dangerous?

We have no specific security note for port 43438. Its risk depends on the program actually listening on it. General advice for network services services:

  • Answer only the networks that need the service (no open resolvers, relays or reflectors).
  • UDP services can be abused for DDoS amplification: rate-limit or block them at the edge.
  • Disable legacy test services that have no use in production.
02 Registry

IANA registry entries for port 43438

ServicePortTransportDescriptionReferenceUpdated
hmip-routing 43438 UDP HmIP LAN Routing - 2018-02-28
-43438-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 43438, and is it reachable?

Linux

sudo ss -ltnup 'sport = :43438'      # process listening on 43438
sudo lsof -nP -i :43438

macOS

sudo lsof -nP -i :43438

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 43438 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 43438
netstat -ano | findstr :43438

From another machine

nmap -p 43438 -sV <host>
sudo nmap -sU -p 43438 <host>
nc -zv <host> 43438

Block it in the firewall

sudo ufw deny 43438/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 43438" -Direction Inbound -LocalPort 43438 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 43438 used for?

Port 43438 is assigned by IANA to hmip-routing (HmIP LAN Routing).

Is port 43438 TCP or UDP?

Port 43438 is registered for UDP.

Is it safe to open port 43438?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Answer only the networks that need the service (no open resolvers, relays or reflectors).

How do I check if port 43438 is open?

On Linux run "ss -ltnup 'sport = :43438'", on macOS "lsof -nP -i :43438", and on Windows "netstat -ano | findstr :43438" to see the local process. From another machine, "nmap -p 43438 <host>" shows whether it is reachable.

05 Related
:53 DNS tcp · udp · moderate risk :135 MS RPC tcp · udp · high risk :123 NTP udp · tcp · moderate risk :67 DHCP server udp · tcp · moderate risk :111 rpcbind tcp · udp · high risk :9100 Raw printing (JetDirect) tcp · udp · high risk :631 IPP / CUPS tcp · udp · high risk :5353 mDNS udp · tcp · moderate risk

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