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// Other services

Port 3484: GBS SnapTalk Protocol

Port 3484 is assigned by IANA to gbs-stp (GBS SnapTalk Protocol).

3484

How gbs-stp works

Other services
client:3484gbs-stpresponse client:3484gbs-stpresponse

The client sends a request to port 3484 and the gbs-stp 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 3484 dangerous?

We have no specific security note for port 3484. 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 3484

ServicePortTransportDescriptionReferenceUpdated
gbs-stp 3484 TCP, UDP GBS SnapTalk Protocol - 2002-05

// source: IANA service name and port number registry

03 Check it

Which program uses port 3484, and is it reachable?

Linux

sudo ss -ltnup 'sport = :3484'      # process listening on 3484
sudo lsof -nP -i :3484

macOS

sudo lsof -nP -i :3484

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 3484 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 3484
netstat -ano | findstr :3484

From another machine

nmap -p 3484 -sV <host>
sudo nmap -sU -p 3484 <host>
nc -zv <host> 3484

Block it in the firewall

sudo ufw deny 3484/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 3484" -Direction Inbound -LocalPort 3484 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 3484 used for?

Port 3484 is assigned by IANA to gbs-stp (GBS SnapTalk Protocol).

Is port 3484 TCP or UDP?

Port 3484 is registered for TCP and UDP.

Is it safe to open port 3484?

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 3484 is open?

On Linux run "ss -ltnup 'sport = :3484'", on macOS "lsof -nP -i :3484", and on Windows "netstat -ano | findstr :3484" to see the local process. From another machine, "nmap -p 3484 <host>" shows whether it is reachable.

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