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// Other services

Port 31029: YaWN - Yet Another Windows Notifier

Port 31029 is assigned by IANA to yawn (YaWN - Yet Another Windows Notifier).

31029

How yawn works

Other services
client:31029yawnresponse client:31029yawnresponse

The client sends a request to port 31029 and the yawn 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 31029 dangerous?

We have no specific security note for port 31029. 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 31029

ServicePortTransportDescriptionReferenceUpdated
yawn 31029 UDP YaWN - Yet Another Windows Notifier - 2010-08-30
-31029-Reserved--

// source: IANA service name and port number registry

03 Check it

Which program uses port 31029, and is it reachable?

Linux

sudo ss -ltnup 'sport = :31029'      # process listening on 31029
sudo lsof -nP -i :31029

macOS

sudo lsof -nP -i :31029

Windows (PowerShell)

Get-NetTCPConnection -LocalPort 31029 -State Listen | Select LocalAddress, OwningProcess
Get-NetUDPEndpoint -LocalPort 31029
netstat -ano | findstr :31029

From another machine

nmap -p 31029 -sV <host>
sudo nmap -sU -p 31029 <host>
nc -zv <host> 31029

Block it in the firewall

sudo ufw deny 31029/udp                                         # Linux (ufw)
New-NetFirewallRule -DisplayName "Block 31029" -Direction Inbound -LocalPort 31029 -Protocol UDP -Action Block  # Windows
04 FAQ
What is port 31029 used for?

Port 31029 is assigned by IANA to yawn (YaWN - Yet Another Windows Notifier).

Is port 31029 TCP or UDP?

Port 31029 is registered for UDP.

Is it safe to open port 31029?

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 31029 is open?

On Linux run "ss -ltnup 'sport = :31029'", on macOS "lsof -nP -i :31029", and on Windows "netstat -ano | findstr :31029" to see the local process. From another machine, "nmap -p 31029 <host>" shows whether it is reachable.

05 Related
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