CyberHunter
Local dataset, no network
// Other services

Port 9321: guibase

Port 9321 is assigned by IANA to guibase (guibase).

9321

How guibase works

Other services
client:9321guibaseresponse client:9321guibaseresponse

The client sends a request to port 9321 and the guibase service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned1 registered service
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 9321 dangerous?

We have no specific security note for port 9321. Its risk depends on the program actually listening on it. General advice for other services services:

  • Close the port if nothing on the host needs it.
  • Identify the process that listens on it (commands below) before opening it in a firewall.
  • Expose a service only to the networks that use it.
02 Registry

IANA registry entries for port 9321

ServicePortTransportDescriptionReferenceUpdated
guibase 9321 TCP, UDP guibase - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 9321, and is it reachable?

Linux

sudo ss -ltnup 'sport = :9321'      # process listening on 9321
sudo lsof -nP -i :9321

macOS

sudo lsof -nP -i :9321

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 9321 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 9321
netstat -ano | findstr :9321

From another machine

nmap -p 9321 -sV <host>
sudo nmap -sU -p 9321 <host>
nc -zv <host> 9321

Block it in the firewall

sudo ufw deny 9321/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 9321" -Direction Inbound -LocalPort 9321 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 9321 used for?

Port 9321 is assigned by IANA to guibase (guibase).

Is port 9321 TCP or UDP?

Port 9321 is registered for TCP and UDP.

Is it safe to open port 9321?

It depends on the program that listens on it. Open it only for a service you know and only to the networks that need it. Close the port if nothing on the host needs it.

How do I check if port 9321 is open?

On Linux run "ss -ltnup 'sport = :9321'", on macOS "lsof -nP -i :9321", and on Windows "netstat -ano | findstr :9321" to see the local process. From another machine, "nmap -p 9321 <host>" shows whether it is reachable.

05 Related
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