CyberHunter
Local dataset, no network
// Other services

Port 3964: SASG GPRS

Port 3964 is assigned by IANA to sasggprs (SASG GPRS).

3964

How sasggprs works

Other services
client:3964sasggprsresponse client:3964sasggprsresponse

The client sends a request to port 3964 and the sasggprs 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 3964 dangerous?

We have no specific security note for port 3964. 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 3964

ServicePortTransportDescriptionReferenceUpdated
sasggprs 3964 TCP, UDP SASG GPRS - 2005-08

// source: IANA service name and port number registry

03 Check it

Which program uses port 3964, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3964'      # process listening on 3964
sudo lsof -nP -i :3964

macOS

sudo lsof -nP -i :3964

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3964 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3964
netstat -ano | findstr :3964

From another machine

nmap -p 3964 -sV <host>
sudo nmap -sU -p 3964 <host>
nc -zv <host> 3964

Block it in the firewall

sudo ufw deny 3964/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3964" -Direction Inbound -LocalPort 3964 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3964 used for?

Port 3964 is assigned by IANA to sasggprs (SASG GPRS).

Is port 3964 TCP or UDP?

Port 3964 is registered for TCP and UDP.

Is it safe to open port 3964?

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 3964 is open?

On Linux run "ss -ltnup 'sport = :3964'", on macOS "lsof -nP -i :3964", and on Windows "netstat -ano | findstr :3964" to see the local process. From another machine, "nmap -p 3964 <host>" shows whether it is reachable.

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