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// Other services

Port 3386: GPRS Data

Port 3386 is assigned by IANA to gprs-data (GPRS Data), gprs-sig (GPRS SIG).

3386

How gprs-data works

Other services
client:3386gprs-dataresponse client:3386gprs-dataresponse

The client sends a request to port 3386 and the gprs-data service answers.

Transport
TCP · UDP
Exposure risk
not rated depends on the program listening
Encryption
Unknownnot stated by the registry
IANA status
Assigned2 registered services
Range
Registered (1024-49151)
Category
Other services
01 Security

Is port 3386 dangerous?

We have no specific security note for port 3386. 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 3386

ServicePortTransportDescriptionReferenceUpdated
gprs-data 3386 TCP GPRS Data - -
gprs-sig 3386 UDP GPRS SIG - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 3386, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3386'      # process listening on 3386
sudo lsof -nP -i :3386

macOS

sudo lsof -nP -i :3386

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3386 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3386
netstat -ano | findstr :3386

From another machine

nmap -p 3386 -sV <host>
sudo nmap -sU -p 3386 <host>
nc -zv <host> 3386

Block it in the firewall

sudo ufw deny 3386/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3386" -Direction Inbound -LocalPort 3386 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3386 used for?

Port 3386 is assigned by IANA to gprs-data (GPRS Data), gprs-sig (GPRS SIG).

Is port 3386 TCP or UDP?

Port 3386 is registered for TCP and UDP.

Is it safe to open port 3386?

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 3386 is open?

On Linux run "ss -ltnup 'sport = :3386'", on macOS "lsof -nP -i :3386", and on Windows "netstat -ano | findstr :3386" to see the local process. From another machine, "nmap -p 3386 <host>" shows whether it is reachable.

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