Port 3009 (pxc-ntfy)

IANA assigns port 3009 to pxc-ntfy: PXC-NTFY.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference

pxc-ntfy TCP PXC-NTFY Takeshi Nishizawa -

pxc-ntfy UDP PXC-NTFY Takeshi Nishizawa -

Linux: is anything listening on TCP 3009?

sudo ss -tlnp 'sport = :3009'

Linux: UDP 3009

sudo ss -ulnp 'sport = :3009'

Linux / macOS: which process owns the port

sudo lsof -nP -i :3009

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':3009 '

Windows (Command Prompt)

netstat -ano | findstr :3009

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3009 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 3009

From Windows

Test-NetConnection HOST -Port 3009

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 3009

ufw

sudo ufw deny 3009/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 3009 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 3009 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 3009' -Direction Inbound -Protocol TCP -LocalPort 3009 -Action Block

ufw

sudo ufw deny 3009/udp

iptables

sudo iptables -A INPUT -p udp --dport 3009 -j DROP

nftables

sudo nft add rule inet filter input udp dport 3009 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 3009' -Direction Inbound -Protocol UDP -LocalPort 3009 -Action Block

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