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// Other services

Port 1089: FF Annunciation

Port 1089 is assigned by IANA to ff-annunc (FF Annunciation).

1089

How ff-annunc works

Other services
client:1089ff-annuncresponse client:1089ff-annuncresponse

The client sends a request to port 1089 and the ff-annunc 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 1089 dangerous?

We have no specific security note for port 1089. 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 1089

ServicePortTransportDescriptionReferenceUpdated
ff-annunc 1089 TCP, UDP FF Annunciation - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 1089, and is it reachable?

Linux

sudo ss -ltnup 'sport = :1089'      # process listening on 1089
sudo lsof -nP -i :1089

macOS

sudo lsof -nP -i :1089

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 1089 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 1089
netstat -ano | findstr :1089

From another machine

nmap -p 1089 -sV <host>
sudo nmap -sU -p 1089 <host>
nc -zv <host> 1089

Block it in the firewall

sudo ufw deny 1089/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 1089" -Direction Inbound -LocalPort 1089 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 1089 used for?

Port 1089 is assigned by IANA to ff-annunc (FF Annunciation).

Is port 1089 TCP or UDP?

Port 1089 is registered for TCP and UDP.

Is it safe to open port 1089?

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 1089 is open?

On Linux run "ss -ltnup 'sport = :1089'", on macOS "lsof -nP -i :1089", and on Windows "netstat -ano | findstr :1089" to see the local process. From another machine, "nmap -p 1089 <host>" shows whether it is reachable.

05 Related
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