CyberHunter
Local dataset, no network
// Other services

Port 397: Multi Protocol Trans. Net.

Port 397 is assigned by IANA to mptn (Multi Protocol Trans. Net.).

397

How mptn works

Other services
client:397mptnresponse client:397mptnresponse

The client sends a request to port 397 and the mptn 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
Well-known (0-1023)
Category
Other services
01 Security

Is port 397 dangerous?

We have no specific security note for port 397. 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 397

ServicePortTransportDescriptionReferenceUpdated
mptn 397 TCP, UDP Multi Protocol Trans. Net. - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 397, and is it reachable?

Linux

sudo ss -ltnup 'sport = :397'      # process listening on 397
sudo lsof -nP -i :397

macOS

sudo lsof -nP -i :397

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 397 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 397
netstat -ano | findstr :397

From another machine

nmap -p 397 -sV <host>
sudo nmap -sU -p 397 <host>
nc -zv <host> 397

Block it in the firewall

sudo ufw deny 397/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 397" -Direction Inbound -LocalPort 397 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 397 used for?

Port 397 is assigned by IANA to mptn (Multi Protocol Trans. Net.).

Is port 397 TCP or UDP?

Port 397 is registered for TCP and UDP.

Is it safe to open port 397?

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 397 is open?

On Linux run "ss -ltnup 'sport = :397'", on macOS "lsof -nP -i :397", and on Windows "netstat -ano | findstr :397" to see the local process. From another machine, "nmap -p 397 <host>" shows whether it is reachable.

05 Related
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