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Port 9339 (gnmi-gnoi)

IANA assigns port 9339 to gnmi-gnoi: gRPC Network Mgmt/Operations Interface.

Registered (user) port, 1024-49151 TCP

IANA assignment

Service nameProtoDescriptionAssigneeReference
gnmi-gnoi TCP gRPC Network Mgmt/Operations Interface Google Netops -

Registry dates for this port: registered 2019-05-09.

Check what is listening on port 9339

Linux: is anything listening on TCP 9339?
sudo ss -tlnp 'sport = :9339'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9339
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9339 '
Windows (Command Prompt)
netstat -ano | findstr :9339
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9339 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9339
From Windows
Test-NetConnection HOST -Port 9339

Block port 9339 in the firewall

ufw
sudo ufw deny 9339/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9339 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9339 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9339' -Direction Inbound -Protocol TCP -LocalPort 9339 -Action Block

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