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// Other services

Port 3924: MPL_GPRS_PORT

Port 3924 is assigned by IANA to mpl-gprs-port (MPL_GPRS_PORT).

3924

How mpl-gprs-port works

Other services
client:3924mpl-gprs-portresponse client:3924mpl-gprs-portresponse

The client sends a request to port 3924 and the mpl-gprs-port 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 3924 dangerous?

We have no specific security note for port 3924. 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 3924

ServicePortTransportDescriptionReferenceUpdated
mpl-gprs-port 3924 TCP, UDP MPL_GPRS_PORT - 2003-11

// source: IANA service name and port number registry

03 Check it

Which program uses port 3924, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3924'      # process listening on 3924
sudo lsof -nP -i :3924

macOS

sudo lsof -nP -i :3924

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3924 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3924
netstat -ano | findstr :3924

From another machine

nmap -p 3924 -sV <host>
sudo nmap -sU -p 3924 <host>
nc -zv <host> 3924

Block it in the firewall

sudo ufw deny 3924/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3924" -Direction Inbound -LocalPort 3924 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3924 used for?

Port 3924 is assigned by IANA to mpl-gprs-port (MPL_GPRS_PORT).

Is port 3924 TCP or UDP?

Port 3924 is registered for TCP and UDP.

Is it safe to open port 3924?

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 3924 is open?

On Linux run "ss -ltnup 'sport = :3924'", on macOS "lsof -nP -i :3924", and on Windows "netstat -ano | findstr :3924" to see the local process. From another machine, "nmap -p 3924 <host>" shows whether it is reachable.

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