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Port 3609 (cpdi-pidas-cm)

IANA assigns port 3609 to cpdi-pidas-cm: CPDI PIDAS Connection Mon.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
cpdi-pidas-cm TCP CPDI PIDAS Connection Mon Tony Splaver -
cpdi-pidas-cm UDP CPDI PIDAS Connection Mon Tony Splaver -

Registry dates for this port: registered 2002-09.

Check what is listening on port 3609

Linux: is anything listening on TCP 3609?
sudo ss -tlnp 'sport = :3609'
Linux: UDP 3609
sudo ss -ulnp 'sport = :3609'
Linux / macOS: which process owns the port
sudo lsof -nP -i :3609
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':3609 '
Windows (Command Prompt)
netstat -ano | findstr :3609
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 3609 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 3609
From Windows
Test-NetConnection HOST -Port 3609
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 3609

Block port 3609 in the firewall

ufw
sudo ufw deny 3609/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 3609 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 3609 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 3609' -Direction Inbound -Protocol TCP -LocalPort 3609 -Action Block
ufw
sudo ufw deny 3609/udp
iptables
sudo iptables -A INPUT -p udp --dport 3609 -j DROP
nftables
sudo nft add rule inet filter input udp dport 3609 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 3609' -Direction Inbound -Protocol UDP -LocalPort 3609 -Action Block

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