CyberHunter
Local dataset, no network
// Other services

Port 28240: Siemens GSM

Port 28240 is assigned by IANA to siemensgsm (Siemens GSM).

28240

How siemensgsm works

Other services
client:28240siemensgsmresponse client:28240siemensgsmresponse

The client sends a request to port 28240 and the siemensgsm 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 28240 dangerous?

We have no specific security note for port 28240. 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 28240

ServicePortTransportDescriptionReferenceUpdated
siemensgsm 28240 TCP, UDP Siemens GSM - 2004-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 28240, and is it reachable?

Linux

sudo ss -ltnup 'sport = :28240'      # process listening on 28240
sudo lsof -nP -i :28240

macOS

sudo lsof -nP -i :28240

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 28240 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 28240
netstat -ano | findstr :28240

From another machine

nmap -p 28240 -sV <host>
sudo nmap -sU -p 28240 <host>
nc -zv <host> 28240

Block it in the firewall

sudo ufw deny 28240/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 28240" -Direction Inbound -LocalPort 28240 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 28240 used for?

Port 28240 is assigned by IANA to siemensgsm (Siemens GSM).

Is port 28240 TCP or UDP?

Port 28240 is registered for TCP and UDP.

Is it safe to open port 28240?

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 28240 is open?

On Linux run "ss -ltnup 'sport = :28240'", on macOS "lsof -nP -i :28240", and on Windows "netstat -ano | findstr :28240" to see the local process. From another machine, "nmap -p 28240 <host>" shows whether it is reachable.

05 Related
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