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// Other services

Port 1689: firefox

Port 1689 is assigned by IANA to firefox (firefox).

1689

How firefox works

Other services
client:1689firefoxresponse client:1689firefoxresponse

The client sends a request to port 1689 and the firefox 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 1689 dangerous?

We have no specific security note for port 1689. 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 1689

ServicePortTransportDescriptionReferenceUpdated
firefox 1689 TCP, UDP firefox - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1689, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1689'      # process listening on 1689
sudo lsof -nP -i :1689

macOS

sudo lsof -nP -i :1689

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1689 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1689
netstat -ano | findstr :1689

From another machine

nmap -p 1689 -sV <host>
sudo nmap -sU -p 1689 <host>
nc -zv <host> 1689

Block it in the firewall

sudo ufw deny 1689/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1689" -Direction Inbound -LocalPort 1689 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1689 used for?

Port 1689 is assigned by IANA to firefox (firefox).

Is port 1689 TCP or UDP?

Port 1689 is registered for TCP and UDP.

Is it safe to open port 1689?

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 1689 is open?

On Linux run "ss -ltnup 'sport = :1689'", on macOS "lsof -nP -i :1689", and on Windows "netstat -ano | findstr :1689" to see the local process. From another machine, "nmap -p 1689 <host>" shows whether it is reachable.

05 Related
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