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Port 8089 (Splunk management)

Splunk management REST API (splunkd).

Registered (user) port, 1024-49151 TCP Monitoring and logging Do not expose to the internet

What port 8089 is used for

Splunk management REST API (splunkd).

Security: should port 8089 be open?

Do not expose to the internet. Restrict to Splunk infrastructure; change default admin credentials.

IANA assignment

Port 8089 is in the registered range and has no IANA assignment. The usage above is unofficial but widespread.

Check what is listening on port 8089

Linux: is anything listening on TCP 8089?
sudo ss -tlnp 'sport = :8089'
Linux / macOS: which process owns the port
sudo lsof -nP -i :8089
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':8089 '
Windows (Command Prompt)
netstat -ano | findstr :8089
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 8089 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 8089
From Windows
Test-NetConnection HOST -Port 8089

Block port 8089 in the firewall

ufw
sudo ufw deny 8089/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 8089 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 8089 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 8089' -Direction Inbound -Protocol TCP -LocalPort 8089 -Action Block

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