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// Other services

Port 9009: Pichat Server

Port 9009 is assigned by IANA to pichat (Pichat Server).

9009

How pichat works

Other services
client:9009pichatresponse client:9009pichatresponse

The client sends a request to port 9009 and the pichat 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 9009 dangerous?

We have no specific security note for port 9009. 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 9009

ServicePortTransportDescriptionReferenceUpdated
pichat 9009 TCP, UDP Pichat Server - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 9009, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9009'      # process listening on 9009
sudo lsof -nP -i :9009

macOS

sudo lsof -nP -i :9009

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9009 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9009
netstat -ano | findstr :9009

From another machine

nmap -p 9009 -sV <host>
sudo nmap -sU -p 9009 <host>
nc -zv <host> 9009

Block it in the firewall

sudo ufw deny 9009/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9009" -Direction Inbound -LocalPort 9009 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9009 used for?

Port 9009 is assigned by IANA to pichat (Pichat Server).

Is port 9009 TCP or UDP?

Port 9009 is registered for TCP and UDP.

Is it safe to open port 9009?

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 9009 is open?

On Linux run "ss -ltnup 'sport = :9009'", on macOS "lsof -nP -i :9009", and on Windows "netstat -ano | findstr :9009" to see the local process. From another machine, "nmap -p 9009 <host>" shows whether it is reachable.

05 Related
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