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// Other services

Port 4729: GSM Interface Tap

Port 4729 is assigned by IANA to gsmtap (GSM Interface Tap).

4729

How gsmtap works

Other services
client:4729gsmtapresponse client:4729gsmtapresponse

The client sends a request to port 4729 and the gsmtap service answers.

Transport
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 4729 dangerous?

We have no specific security note for port 4729. 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 4729

ServicePortTransportDescriptionReferenceUpdated
gsmtap 4729 UDP GSM Interface Tap - 2009-01-16
-4729-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 4729, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4729'      # process listening on 4729
sudo lsof -nP -i :4729

macOS

sudo lsof -nP -i :4729

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4729 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4729
netstat -ano | findstr :4729

From another machine

nmap -p 4729 -sV <host>
sudo nmap -sU -p 4729 <host>
nc -zv <host> 4729

Block it in the firewall

sudo ufw deny 4729/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4729" -Direction Inbound -LocalPort 4729 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 4729 used for?

Port 4729 is assigned by IANA to gsmtap (GSM Interface Tap).

Is port 4729 TCP or UDP?

Port 4729 is registered for UDP.

Is it safe to open port 4729?

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 4729 is open?

On Linux run "ss -ltnup 'sport = :4729'", on macOS "lsof -nP -i :4729", and on Windows "netstat -ano | findstr :4729" to see the local process. From another machine, "nmap -p 4729 <host>" shows whether it is reachable.

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