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// Other services

Port 3109: Personnel protocol

Port 3109 is assigned by IANA to personnel (Personnel protocol).

3109

How personnel works

Other services
client:3109personnelresponse client:3109personnelresponse

The client sends a request to port 3109 and the personnel 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 3109 dangerous?

We have no specific security note for port 3109. 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 3109

ServicePortTransportDescriptionReferenceUpdated
personnel 3109 TCP, UDP Personnel protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3109, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3109'      # process listening on 3109
sudo lsof -nP -i :3109

macOS

sudo lsof -nP -i :3109

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3109 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3109
netstat -ano | findstr :3109

From another machine

nmap -p 3109 -sV <host>
sudo nmap -sU -p 3109 <host>
nc -zv <host> 3109

Block it in the firewall

sudo ufw deny 3109/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3109" -Direction Inbound -LocalPort 3109 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3109 used for?

Port 3109 is assigned by IANA to personnel (Personnel protocol).

Is port 3109 TCP or UDP?

Port 3109 is registered for TCP and UDP.

Is it safe to open port 3109?

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 3109 is open?

On Linux run "ss -ltnup 'sport = :3109'", on macOS "lsof -nP -i :3109", and on Windows "netstat -ano | findstr :3109" to see the local process. From another machine, "nmap -p 3109 <host>" shows whether it is reachable.

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