CyberHunter
Local dataset, no network
// Other services

Port 544: krcmd

Port 544 is assigned by IANA to kshell (krcmd).

544

How kshell works

Other services
client:544kshellresponse client:544kshellresponse

The client sends a request to port 544 and the kshell 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 544 dangerous?

We have no specific security note for port 544. 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 544

ServicePortTransportDescriptionReferenceUpdated
kshell 544 TCP, UDP krcmd - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 544, and is it reachable?

Linux

sudo ss -ltnup 'sport = :544'      # process listening on 544
sudo lsof -nP -i :544

macOS

sudo lsof -nP -i :544

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 544 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 544
netstat -ano | findstr :544

From another machine

nmap -p 544 -sV <host>
sudo nmap -sU -p 544 <host>
nc -zv <host> 544

Block it in the firewall

sudo ufw deny 544/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 544" -Direction Inbound -LocalPort 544 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 544 used for?

Port 544 is assigned by IANA to kshell (krcmd).

Is port 544 TCP or UDP?

Port 544 is registered for TCP and UDP.

Is it safe to open port 544?

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 544 is open?

On Linux run "ss -ltnup 'sport = :544'", on macOS "lsof -nP -i :544", and on Windows "netstat -ano | findstr :544" to see the local process. From another machine, "nmap -p 544 <host>" shows whether it is reachable.

05 Related
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