CyberHunter
Local dataset, no network
// Other services

Port 19541: JCP Client

Port 19541 is assigned by IANA to jcp (JCP Client).

19541

How jcp works

Other services
client:19541jcpresponse client:19541jcpresponse

The client sends a request to port 19541 and the jcp 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 19541 dangerous?

We have no specific security note for port 19541. 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 19541

ServicePortTransportDescriptionReferenceUpdated
jcp 19541 TCP, UDP JCP Client - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 19541, and is it reachable?

Linux

sudo ss -ltnup 'sport = :19541'      # process listening on 19541
sudo lsof -nP -i :19541

macOS

sudo lsof -nP -i :19541

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 19541 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 19541
netstat -ano | findstr :19541

From another machine

nmap -p 19541 -sV <host>
sudo nmap -sU -p 19541 <host>
nc -zv <host> 19541

Block it in the firewall

sudo ufw deny 19541/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 19541" -Direction Inbound -LocalPort 19541 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 19541 used for?

Port 19541 is assigned by IANA to jcp (JCP Client).

Is port 19541 TCP or UDP?

Port 19541 is registered for TCP and UDP.

Is it safe to open port 19541?

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 19541 is open?

On Linux run "ss -ltnup 'sport = :19541'", on macOS "lsof -nP -i :19541", and on Windows "netstat -ano | findstr :19541" to see the local process. From another machine, "nmap -p 19541 <host>" shows whether it is reachable.

05 Related
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