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Local dataset, no network
// Other services

Port 4599: A17 (AN-AN)

Port 4599 is assigned by IANA to a17-an-an (A17 (AN-AN)).

4599

How a17-an-an works

Other services
client:4599a17-an-anresponse client:4599a17-an-anresponse

The client sends a request to port 4599 and the a17-an-an 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 4599 dangerous?

We have no specific security note for port 4599. 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 4599

ServicePortTransportDescriptionReferenceUpdated
a17-an-an 4599 TCP, UDP A17 (AN-AN) - 2006-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 4599, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4599'      # process listening on 4599
sudo lsof -nP -i :4599

macOS

sudo lsof -nP -i :4599

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4599 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4599
netstat -ano | findstr :4599

From another machine

nmap -p 4599 -sV <host>
sudo nmap -sU -p 4599 <host>
nc -zv <host> 4599

Block it in the firewall

sudo ufw deny 4599/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4599" -Direction Inbound -LocalPort 4599 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4599 used for?

Port 4599 is assigned by IANA to a17-an-an (A17 (AN-AN)).

Is port 4599 TCP or UDP?

Port 4599 is registered for TCP and UDP.

Is it safe to open port 4599?

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 4599 is open?

On Linux run "ss -ltnup 'sport = :4599'", on macOS "lsof -nP -i :4599", and on Windows "netstat -ano | findstr :4599" to see the local process. From another machine, "nmap -p 4599 <host>" shows whether it is reachable.

05 Related
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