CyberHunter
Local dataset, no network
// Other services

Port 3271: CSoft Prev Port

Port 3271 is assigned by IANA to csoft-prev (CSoft Prev Port).

3271

How csoft-prev works

Other services
client:3271csoft-prevresponse client:3271csoft-prevresponse

The client sends a request to port 3271 and the csoft-prev 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 3271 dangerous?

We have no specific security note for port 3271. 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 3271

ServicePortTransportDescriptionReferenceUpdated
csoft-prev 3271 TCP, UDP CSoft Prev Port - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3271, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3271'      # process listening on 3271
sudo lsof -nP -i :3271

macOS

sudo lsof -nP -i :3271

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3271 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3271
netstat -ano | findstr :3271

From another machine

nmap -p 3271 -sV <host>
sudo nmap -sU -p 3271 <host>
nc -zv <host> 3271

Block it in the firewall

sudo ufw deny 3271/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3271" -Direction Inbound -LocalPort 3271 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3271 used for?

Port 3271 is assigned by IANA to csoft-prev (CSoft Prev Port).

Is port 3271 TCP or UDP?

Port 3271 is registered for TCP and UDP.

Is it safe to open port 3271?

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 3271 is open?

On Linux run "ss -ltnup 'sport = :3271'", on macOS "lsof -nP -i :3271", and on Windows "netstat -ano | findstr :3271" to see the local process. From another machine, "nmap -p 3271 <host>" shows whether it is reachable.

05 Related
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