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// Other services

Port 4029: IP Q signaling protocol

Port 4029 is assigned by IANA to ip-qsig (IP Q signaling protocol).

4029

How ip-qsig works

Other services
client:4029ip-qsigresponse client:4029ip-qsigresponse

The client sends a request to port 4029 and the ip-qsig 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 4029 dangerous?

We have no specific security note for port 4029. 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 4029

ServicePortTransportDescriptionReferenceUpdated
ip-qsig 4029 TCP, UDP IP Q signaling protocol - -

// source: IANA service name and port number registry

03 Check it

Which program uses port 4029, and is it reachable?

Linux

sudo ss -ltnup 'sport = :4029'      # process listening on 4029
sudo lsof -nP -i :4029

macOS

sudo lsof -nP -i :4029

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 4029 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 4029
netstat -ano | findstr :4029

From another machine

nmap -p 4029 -sV <host>
sudo nmap -sU -p 4029 <host>
nc -zv <host> 4029

Block it in the firewall

sudo ufw deny 4029/tcp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 4029" -Direction Inbound -LocalPort 4029 -Protocol TCP -Action Block  # Windows
04 FAQ
What is port 4029 used for?

Port 4029 is assigned by IANA to ip-qsig (IP Q signaling protocol).

Is port 4029 TCP or UDP?

Port 4029 is registered for TCP and UDP.

Is it safe to open port 4029?

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 4029 is open?

On Linux run "ss -ltnup 'sport = :4029'", on macOS "lsof -nP -i :4029", and on Windows "netstat -ano | findstr :4029" to see the local process. From another machine, "nmap -p 4029 <host>" shows whether it is reachable.

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