HTTPfy

Port 1089 (ff-annunc)

IANA assigns port 1089 to ff-annunc: FF Annunciation.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ff-annunc TCP FF Annunciation - -
ff-annunc UDP FF Annunciation - -

Check what is listening on port 1089

Linux: is anything listening on TCP 1089?
sudo ss -tlnp 'sport = :1089'
Linux: UDP 1089
sudo ss -ulnp 'sport = :1089'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1089
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1089 '
Windows (Command Prompt)
netstat -ano | findstr :1089
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1089 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1089
From Windows
Test-NetConnection HOST -Port 1089
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1089

Block port 1089 in the firewall

ufw
sudo ufw deny 1089/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1089 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1089 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1089' -Direction Inbound -Protocol TCP -LocalPort 1089 -Action Block
ufw
sudo ufw deny 1089/udp
iptables
sudo iptables -A INPUT -p udp --dport 1089 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1089 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1089' -Direction Inbound -Protocol UDP -LocalPort 1089 -Action Block

Related ports

1087cplscrambler-in1088cplscrambler-al1090ff-fms1091ff-sm

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.