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// Other services

Port 9191: Sun AppSvr JPDA

Port 9191 is assigned by IANA to sun-as-jpda (Sun AppSvr JPDA).

9191

How sun-as-jpda works

Other services
client:9191sun-as-jpdaresponse client:9191sun-as-jpdaresponse

The client sends a request to port 9191 and the sun-as-jpda 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 9191 dangerous?

We have no specific security note for port 9191. 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 9191

ServicePortTransportDescriptionReferenceUpdated
sun-as-jpda 9191 TCP, UDP Sun AppSvr JPDA - 2005-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 9191, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9191'      # process listening on 9191
sudo lsof -nP -i :9191

macOS

sudo lsof -nP -i :9191

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9191 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9191
netstat -ano | findstr :9191

From another machine

nmap -p 9191 -sV <host>
sudo nmap -sU -p 9191 <host>
nc -zv <host> 9191

Block it in the firewall

sudo ufw deny 9191/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9191" -Direction Inbound -LocalPort 9191 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9191 used for?

Port 9191 is assigned by IANA to sun-as-jpda (Sun AppSvr JPDA).

Is port 9191 TCP or UDP?

Port 9191 is registered for TCP and UDP.

Is it safe to open port 9191?

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 9191 is open?

On Linux run "ss -ltnup 'sport = :9191'", on macOS "lsof -nP -i :9191", and on Windows "netstat -ano | findstr :9191" to see the local process. From another machine, "nmap -p 9191 <host>" shows whether it is reachable.

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