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// Other services

Port 9996: Palace-5

Port 9996 is assigned by IANA to palace-5 (Palace-5).

9996

How palace-5 works

Other services
client:9996palace-5response client:9996palace-5response

The client sends a request to port 9996 and the palace-5 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 9996 dangerous?

We have no specific security note for port 9996. 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 9996

ServicePortTransportDescriptionReferenceUpdated
palace-5 9996 TCP, UDP Palace-5 - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9996, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9996'      # process listening on 9996
sudo lsof -nP -i :9996

macOS

sudo lsof -nP -i :9996

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9996 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9996
netstat -ano | findstr :9996

From another machine

nmap -p 9996 -sV <host>
sudo nmap -sU -p 9996 <host>
nc -zv <host> 9996

Block it in the firewall

sudo ufw deny 9996/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9996" -Direction Inbound -LocalPort 9996 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9996 used for?

Port 9996 is assigned by IANA to palace-5 (Palace-5).

Is port 9996 TCP or UDP?

Port 9996 is registered for TCP and UDP.

Is it safe to open port 9996?

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 9996 is open?

On Linux run "ss -ltnup 'sport = :9996'", on macOS "lsof -nP -i :9996", and on Windows "netstat -ano | findstr :9996" to see the local process. From another machine, "nmap -p 9996 <host>" shows whether it is reachable.

05 Related
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