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// Other services

Port 9104: PeerWire

Port 9104 is assigned by IANA to peerwire (PeerWire).

9104

How peerwire works

Other services
client:9104peerwireresponse client:9104peerwireresponse

The client sends a request to port 9104 and the peerwire 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 9104 dangerous?

We have no specific security note for port 9104. 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 9104

ServicePortTransportDescriptionReferenceUpdated
peerwire 9104 TCP, UDP PeerWire - 2004-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 9104, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9104'      # process listening on 9104
sudo lsof -nP -i :9104

macOS

sudo lsof -nP -i :9104

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9104 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9104
netstat -ano | findstr :9104

From another machine

nmap -p 9104 -sV <host>
sudo nmap -sU -p 9104 <host>
nc -zv <host> 9104

Block it in the firewall

sudo ufw deny 9104/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9104" -Direction Inbound -LocalPort 9104 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9104 used for?

Port 9104 is assigned by IANA to peerwire (PeerWire).

Is port 9104 TCP or UDP?

Port 9104 is registered for TCP and UDP.

Is it safe to open port 9104?

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 9104 is open?

On Linux run "ss -ltnup 'sport = :9104'", on macOS "lsof -nP -i :9104", and on Windows "netstat -ano | findstr :9104" to see the local process. From another machine, "nmap -p 9104 <host>" shows whether it is reachable.

05 Related
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