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// Other services

Port 3409: NetworkLens Event Port

Port 3409 is assigned by IANA to networklens (NetworkLens Event Port).

3409

How networklens works

Other services
client:3409networklensresponse client:3409networklensresponse

The client sends a request to port 3409 and the networklens 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 3409 dangerous?

We have no specific security note for port 3409. 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 3409

ServicePortTransportDescriptionReferenceUpdated
networklens 3409 TCP, UDP NetworkLens Event Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3409, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3409'      # process listening on 3409
sudo lsof -nP -i :3409

macOS

sudo lsof -nP -i :3409

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3409 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3409
netstat -ano | findstr :3409

From another machine

nmap -p 3409 -sV <host>
sudo nmap -sU -p 3409 <host>
nc -zv <host> 3409

Block it in the firewall

sudo ufw deny 3409/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3409" -Direction Inbound -LocalPort 3409 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3409 used for?

Port 3409 is assigned by IANA to networklens (NetworkLens Event Port).

Is port 3409 TCP or UDP?

Port 3409 is registered for TCP and UDP.

Is it safe to open port 3409?

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 3409 is open?

On Linux run "ss -ltnup 'sport = :3409'", on macOS "lsof -nP -i :3409", and on Windows "netstat -ano | findstr :3409" to see the local process. From another machine, "nmap -p 3409 <host>" shows whether it is reachable.

05 Related
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