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// Other services

Port 5605: A4-SDUNode

Port 5605 is assigned by IANA to a4-sdunode (A4-SDUNode).

5605

How a4-sdunode works

Other services
client:5605a4-sdunoderesponse client:5605a4-sdunoderesponse

The client sends a request to port 5605 and the a4-sdunode service answers.

Transport
TCP · 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
Other services
01 Security

Is port 5605 dangerous?

We have no specific security note for port 5605. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 5605

ServicePortTransportDescriptionReferenceUpdated
a4-sdunode 5605 TCP, UDP A4-SDUNode - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5605, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5605'      # process listening on 5605
sudo lsof -nP -i :5605

macOS

sudo lsof -nP -i :5605

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5605 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5605
netstat -ano | findstr :5605

From another machine

nmap -p 5605 -sV <host>
sudo nmap -sU -p 5605 <host>
nc -zv <host> 5605

Block it in the firewall

sudo ufw deny 5605/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5605" -Direction Inbound -LocalPort 5605 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5605 used for?

Port 5605 is assigned by IANA to a4-sdunode (A4-SDUNode).

Is port 5605 TCP or UDP?

Port 5605 is registered for TCP and UDP.

Is it safe to open port 5605?

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. Close the port if nothing on the host needs it.

How do I check if port 5605 is open?

On Linux run "ss -ltnup 'sport = :5605'", on macOS "lsof -nP -i :5605", and on Windows "netstat -ano | findstr :5605" to see the local process. From another machine, "nmap -p 5605 <host>" shows whether it is reachable.

05 Related
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