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// Other services

Port 5604: A3-SDUNode

Port 5604 is assigned by IANA to a3-sdunode (A3-SDUNode).

5604

How a3-sdunode works

Other services
client:5604a3-sdunoderesponse client:5604a3-sdunoderesponse

The client sends a request to port 5604 and the a3-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 5604 dangerous?

We have no specific security note for port 5604. 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 5604

ServicePortTransportDescriptionReferenceUpdated
a3-sdunode 5604 TCP, UDP A3-SDUNode - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 5604, and is it reachable?

Linux

sudo ss -ltnup 'sport = :5604'      # process listening on 5604
sudo lsof -nP -i :5604

macOS

sudo lsof -nP -i :5604

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 5604 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 5604
netstat -ano | findstr :5604

From another machine

nmap -p 5604 -sV <host>
sudo nmap -sU -p 5604 <host>
nc -zv <host> 5604

Block it in the firewall

sudo ufw deny 5604/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 5604" -Direction Inbound -LocalPort 5604 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 5604 used for?

Port 5604 is assigned by IANA to a3-sdunode (A3-SDUNode).

Is port 5604 TCP or UDP?

Port 5604 is registered for TCP and UDP.

Is it safe to open port 5604?

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 5604 is open?

On Linux run "ss -ltnup 'sport = :5604'", on macOS "lsof -nP -i :5604", and on Windows "netstat -ano | findstr :5604" to see the local process. From another machine, "nmap -p 5604 <host>" shows whether it is reachable.

05 Related
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