CyberHunter
Local dataset, no network
// Other services

Port 3391: SAVANT

Port 3391 is assigned by IANA to savant (SAVANT).

3391

How savant works

Other services
client:3391savantresponse client:3391savantresponse

The client sends a request to port 3391 and the savant 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 3391 dangerous?

We have no specific security note for port 3391. 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 3391

ServicePortTransportDescriptionReferenceUpdated
savant 3391 TCP, UDP SAVANT - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3391, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3391'      # process listening on 3391
sudo lsof -nP -i :3391

macOS

sudo lsof -nP -i :3391

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3391 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3391
netstat -ano | findstr :3391

From another machine

nmap -p 3391 -sV <host>
sudo nmap -sU -p 3391 <host>
nc -zv <host> 3391

Block it in the firewall

sudo ufw deny 3391/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3391" -Direction Inbound -LocalPort 3391 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3391 used for?

Port 3391 is assigned by IANA to savant (SAVANT).

Is port 3391 TCP or UDP?

Port 3391 is registered for TCP and UDP.

Is it safe to open port 3391?

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 3391 is open?

On Linux run "ss -ltnup 'sport = :3391'", on macOS "lsof -nP -i :3391", and on Windows "netstat -ano | findstr :3391" to see the local process. From another machine, "nmap -p 3391 <host>" shows whether it is reachable.

05 Related
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