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Port 1209 (ipcd3)

IANA assigns port 1209 to ipcd3: IPCD3.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
ipcd3 TCP IPCD3 Mark Ciskey -
ipcd3 UDP IPCD3 Mark Ciskey -

Check what is listening on port 1209

Linux: is anything listening on TCP 1209?
sudo ss -tlnp 'sport = :1209'
Linux: UDP 1209
sudo ss -ulnp 'sport = :1209'
Linux / macOS: which process owns the port
sudo lsof -nP -i :1209
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':1209 '
Windows (Command Prompt)
netstat -ano | findstr :1209
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 1209 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 1209
From Windows
Test-NetConnection HOST -Port 1209
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 1209

Block port 1209 in the firewall

ufw
sudo ufw deny 1209/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 1209 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 1209 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 1209' -Direction Inbound -Protocol TCP -LocalPort 1209 -Action Block
ufw
sudo ufw deny 1209/udp
iptables
sudo iptables -A INPUT -p udp --dport 1209 -j DROP
nftables
sudo nft add rule inet filter input udp dport 1209 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 1209' -Direction Inbound -Protocol UDP -LocalPort 1209 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.