CyberHunter
Local dataset, no network
// Other services

Port 19540: SXUPTP

Port 19540 is assigned by IANA to sxuptp (SXUPTP).

19540

How sxuptp works

Other services
client:19540sxuptpresponse client:19540sxuptpresponse

The client sends a request to port 19540 and the sxuptp 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 19540 dangerous?

We have no specific security note for port 19540. 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 19540

ServicePortTransportDescriptionReferenceUpdated
sxuptp 19540 TCP, UDP SXUPTP - 2002-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 19540, and is it reachable?

Linux

sudo ss -ltnup 'sport = :19540'      # process listening on 19540
sudo lsof -nP -i :19540

macOS

sudo lsof -nP -i :19540

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 19540 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 19540
netstat -ano | findstr :19540

From another machine

nmap -p 19540 -sV <host>
sudo nmap -sU -p 19540 <host>
nc -zv <host> 19540

Block it in the firewall

sudo ufw deny 19540/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 19540" -Direction Inbound -LocalPort 19540 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 19540 used for?

Port 19540 is assigned by IANA to sxuptp (SXUPTP).

Is port 19540 TCP or UDP?

Port 19540 is registered for TCP and UDP.

Is it safe to open port 19540?

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 19540 is open?

On Linux run "ss -ltnup 'sport = :19540'", on macOS "lsof -nP -i :19540", and on Windows "netstat -ano | findstr :19540" to see the local process. From another machine, "nmap -p 19540 <host>" shows whether it is reachable.

05 Related
:4444 Metasploit default / krb524 tcp · udp · high risk :31337 Back Orifice / elite tcp · udp · high risk :1 TCP Port Service Multiplexer tcp · udp :5 Remote Job Entry tcp · udp :9 Discard tcp · udp · sctp · dccp :11 Active Users tcp · udp :17 Quote of the Day tcp · udp :18 Message Send Protocol (historic) tcp · udp

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