Port 9306 (sphinxql)

IANA assigns port 9306 to sphinxql: Sphinx search server (MySQL listener).

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference

sphinxql TCP Sphinx search server (MySQL listener) Andrew Aksyonoff -

Registry dates for this port: registered 2009-10-20.

Linux: is anything listening on TCP 9306?

sudo ss -tlnp 'sport = :9306'

Linux / macOS: which process owns the port

sudo lsof -nP -i :9306

Older Linux / BSD (net-tools)

sudo netstat -tlnp | grep ':9306 '

Windows (Command Prompt)

netstat -ano | findstr :9306

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9306 -State Listen | Select LocalAddress,OwningProcess

From another machine

nc -vz -w 5 HOST 9306

From Windows

Test-NetConnection HOST -Port 9306

ufw

sudo ufw deny 9306/tcp

iptables

sudo iptables -A INPUT -p tcp --dport 9306 -j DROP

nftables

sudo nft add rule inet filter input tcp dport 9306 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block TCP 9306' -Direction Inbound -Protocol TCP -LocalPort 9306 -Action Block

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