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Port 9088 (sqlexec)

IANA assigns port 9088 to sqlexec: IBM Informix SQL Interface.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
sqlexec TCP IBM Informix SQL Interface Jonathan Leffler -
sqlexec UDP IBM Informix SQL Interface Jonathan Leffler -

Registry dates for this port: registered 2005-12.

Check what is listening on port 9088

Linux: is anything listening on TCP 9088?
sudo ss -tlnp 'sport = :9088'
Linux: UDP 9088
sudo ss -ulnp 'sport = :9088'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9088
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9088 '
Windows (Command Prompt)
netstat -ano | findstr :9088
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9088 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9088
From Windows
Test-NetConnection HOST -Port 9088
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9088

Block port 9088 in the firewall

ufw
sudo ufw deny 9088/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9088 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9088 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9088' -Direction Inbound -Protocol TCP -LocalPort 9088 -Action Block
ufw
sudo ufw deny 9088/udp
iptables
sudo iptables -A INPUT -p udp --dport 9088 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9088 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9088' -Direction Inbound -Protocol UDP -LocalPort 9088 -Action Block

Related ports

9086net2display9087classic9089sqlexec-ssl9090Prometheus

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