CyberHunter
Local dataset, no network
// Other services

Port 398: Kryptolan

Port 398 is assigned by IANA to kryptolan (Kryptolan).

398

How kryptolan works

Other services
client:398kryptolanresponse client:398kryptolanresponse

The client sends a request to port 398 and the kryptolan 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 398 dangerous?

We have no specific security note for port 398. 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 398

ServicePortTransportDescriptionReferenceUpdated
kryptolan 398 TCP, UDP Kryptolan - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 398, and is it reachable?

Linux

sudo ss -ltnup 'sport = :398'      # process listening on 398
sudo lsof -nP -i :398

macOS

sudo lsof -nP -i :398

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 398 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 398
netstat -ano | findstr :398

From another machine

nmap -p 398 -sV <host>
sudo nmap -sU -p 398 <host>
nc -zv <host> 398

Block it in the firewall

sudo ufw deny 398/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 398" -Direction Inbound -LocalPort 398 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 398 used for?

Port 398 is assigned by IANA to kryptolan (Kryptolan).

Is port 398 TCP or UDP?

Port 398 is registered for TCP and UDP.

Is it safe to open port 398?

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 398 is open?

On Linux run "ss -ltnup 'sport = :398'", on macOS "lsof -nP -i :398", and on Windows "netstat -ano | findstr :398" to see the local process. From another machine, "nmap -p 398 <host>" shows whether it is reachable.

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