HTTPfy

Port 9321 (guibase)

IANA assigns port 9321 to guibase.

Registered (user) port, 1024-49151 TCPUDP

IANA assignment

Service nameProtoDescriptionAssigneeReference
guibase TCP guibase Yutaka Ono -
guibase UDP guibase Yutaka Ono -

Check what is listening on port 9321

Linux: is anything listening on TCP 9321?
sudo ss -tlnp 'sport = :9321'
Linux: UDP 9321
sudo ss -ulnp 'sport = :9321'
Linux / macOS: which process owns the port
sudo lsof -nP -i :9321
Older Linux / BSD (net-tools)
sudo netstat -tlnp | grep ':9321 '
Windows (Command Prompt)
netstat -ano | findstr :9321
Windows (PowerShell)
Get-NetTCPConnection -LocalPort 9321 -State Listen | Select LocalAddress,OwningProcess

Test it from outside

From another machine
nc -vz -w 5 HOST 9321
From Windows
Test-NetConnection HOST -Port 9321
UDP probe (no reply does not prove it is closed)
nc -vzu -w 5 HOST 9321

Block port 9321 in the firewall

ufw
sudo ufw deny 9321/tcp
iptables
sudo iptables -A INPUT -p tcp --dport 9321 -j DROP
nftables
sudo nft add rule inet filter input tcp dport 9321 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block TCP 9321' -Direction Inbound -Protocol TCP -LocalPort 9321 -Action Block
ufw
sudo ufw deny 9321/udp
iptables
sudo iptables -A INPUT -p udp --dport 9321 -j DROP
nftables
sudo nft add rule inet filter input udp dport 9321 drop
Windows Firewall
New-NetFirewallRule -DisplayName 'Block UDP 9321' -Direction Inbound -Protocol UDP -LocalPort 9321 -Action Block

Related ports

9312sphinxapi9318secure-ts9339gnmi-gnoi9340gribi

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