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// Other services

Port 3351: Btrieve port

Port 3351 is assigned by IANA to btrieve (Btrieve port).

3351

How btrieve works

Other services
client:3351btrieveresponse client:3351btrieveresponse

The client sends a request to port 3351 and the btrieve 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 3351 dangerous?

We have no specific security note for port 3351. 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 3351

ServicePortTransportDescriptionReferenceUpdated
btrieve 3351 TCP, UDP Btrieve port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3351, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3351'      # process listening on 3351
sudo lsof -nP -i :3351

macOS

sudo lsof -nP -i :3351

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3351 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3351
netstat -ano | findstr :3351

From another machine

nmap -p 3351 -sV <host>
sudo nmap -sU -p 3351 <host>
nc -zv <host> 3351

Block it in the firewall

sudo ufw deny 3351/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3351" -Direction Inbound -LocalPort 3351 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3351 used for?

Port 3351 is assigned by IANA to btrieve (Btrieve port).

Is port 3351 TCP or UDP?

Port 3351 is registered for TCP and UDP.

Is it safe to open port 3351?

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 3351 is open?

On Linux run "ss -ltnup 'sport = :3351'", on macOS "lsof -nP -i :3351", and on Windows "netstat -ano | findstr :3351" to see the local process. From another machine, "nmap -p 3351 <host>" shows whether it is reachable.

05 Related
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