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Port 9009 (pichat)

IANA assigns port 9009 to pichat: Pichat Server.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
pichat TCP Pichat Server Mark Seuffert -
pichat UDP Pichat Server Mark Seuffert -

Registry dates for this port: registered 2004-11.

Check what is listening on port 9009

Linux: is anything listening on TCP 9009?
sudo ss -tlnp 'sport = :9009'
Linux: UDP 9009
sudo ss -ulnp 'sport = :9009'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9009
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9009 '
Windows (Command Prompt)
netstat -ano | findstr :9009
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9009 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9009
From Windows
Test-NetConnection HOST -Port 9009
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9009

Block port 9009 in the firewall

ufw
sudo ufw deny 9009/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9009 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9009 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9009' -Direction Inbound -Protocol TCP -LocalPort 9009 -Action Block
ufw
sudo ufw deny 9009/udp
iptables
sudo iptables -A INPUT -p udp --dport 9009 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9009 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9009' -Direction Inbound -Protocol UDP -LocalPort 9009 -Action Block

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