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// Other services

Port 18241: Check Point RTM

Port 18241 is assigned by IANA to checkpoint-rtm (Check Point RTM).

18241

How checkpoint-rtm works

Other services
client:18241checkpoint-rtmresponse client:18241checkpoint-rtmresponse

The client sends a request to port 18241 and the checkpoint-rtm 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 18241 dangerous?

We have no specific security note for port 18241. 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 18241

ServicePortTransportDescriptionReferenceUpdated
checkpoint-rtm 18241 TCP, UDP Check Point RTM - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 18241, and is it reachable?

Linux

sudo ss -ltnup 'sport = :18241'      # process listening on 18241
sudo lsof -nP -i :18241

macOS

sudo lsof -nP -i :18241

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 18241 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 18241
netstat -ano | findstr :18241

From another machine

nmap -p 18241 -sV <host>
sudo nmap -sU -p 18241 <host>
nc -zv <host> 18241

Block it in the firewall

sudo ufw deny 18241/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 18241" -Direction Inbound -LocalPort 18241 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 18241 used for?

Port 18241 is assigned by IANA to checkpoint-rtm (Check Point RTM).

Is port 18241 TCP or UDP?

Port 18241 is registered for TCP and UDP.

Is it safe to open port 18241?

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 18241 is open?

On Linux run "ss -ltnup 'sport = :18241'", on macOS "lsof -nP -i :18241", and on Windows "netstat -ano | findstr :18241" to see the local process. From another machine, "nmap -p 18241 <host>" shows whether it is reachable.

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