CyberHunter
Local dataset, no network
// Other services

Port 3406: Nokia Announcement ch 2

Port 3406 is assigned by IANA to nokia-ann-ch2 (Nokia Announcement ch 2).

3406

How nokia-ann-ch2 works

Other services
client:3406nokia-ann-ch2response client:3406nokia-ann-ch2response

The client sends a request to port 3406 and the nokia-ann-ch2 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 3406 dangerous?

We have no specific security note for port 3406. 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 3406

ServicePortTransportDescriptionReferenceUpdated
nokia-ann-ch2 3406 TCP, UDP Nokia Announcement ch 2 - 2002-02

// source: IANA service name and port number registry

03 Check it

Which program uses port 3406, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3406'      # process listening on 3406
sudo lsof -nP -i :3406

macOS

sudo lsof -nP -i :3406

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3406 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3406
netstat -ano | findstr :3406

From another machine

nmap -p 3406 -sV <host>
sudo nmap -sU -p 3406 <host>
nc -zv <host> 3406

Block it in the firewall

sudo ufw deny 3406/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3406" -Direction Inbound -LocalPort 3406 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3406 used for?

Port 3406 is assigned by IANA to nokia-ann-ch2 (Nokia Announcement ch 2).

Is port 3406 TCP or UDP?

Port 3406 is registered for TCP and UDP.

Is it safe to open port 3406?

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 3406 is open?

On Linux run "ss -ltnup 'sport = :3406'", on macOS "lsof -nP -i :3406", and on Windows "netstat -ano | findstr :3406" to see the local process. From another machine, "nmap -p 3406 <host>" shows whether it is reachable.

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