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// Other services

Port 19539: FXUPTP

Port 19539 is assigned by IANA to fxuptp (FXUPTP).

19539

How fxuptp works

Other services
client:19539fxuptpresponse client:19539fxuptpresponse

The client sends a request to port 19539 and the fxuptp 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 19539 dangerous?

We have no specific security note for port 19539. 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 19539

ServicePortTransportDescriptionReferenceUpdated
fxuptp 19539 TCP, UDP FXUPTP - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 19539, and is it reachable?

Linux

sudo ss -ltnup 'sport = :19539'      # process listening on 19539
sudo lsof -nP -i :19539

macOS

sudo lsof -nP -i :19539

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 19539 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 19539
netstat -ano | findstr :19539

From another machine

nmap -p 19539 -sV <host>
sudo nmap -sU -p 19539 <host>
nc -zv <host> 19539

Block it in the firewall

sudo ufw deny 19539/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 19539" -Direction Inbound -LocalPort 19539 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 19539 used for?

Port 19539 is assigned by IANA to fxuptp (FXUPTP).

Is port 19539 TCP or UDP?

Port 19539 is registered for TCP and UDP.

Is it safe to open port 19539?

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 19539 is open?

On Linux run "ss -ltnup 'sport = :19539'", on macOS "lsof -nP -i :19539", and on Windows "netstat -ano | findstr :19539" to see the local process. From another machine, "nmap -p 19539 <host>" shows whether it is reachable.

05 Related
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