Port 31029 (yawn)

IANA assigns port 31029 to yawn: YaWN - Yet Another Windows Notifier.

Registered (user) port, 1024-49151 UDP

Port 31029 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

IANA assignment

Service nameProtoDescriptionAssigneeReference

yawn UDP YaWN - Yet Another Windows Notifier David Spivey -

Registry dates for this port: registered 2010-08-30.

Linux: UDP 31029

sudo ss -ulnp 'sport = :31029'

Linux / macOS: which process owns the port

sudo lsof -nP -i :31029

Windows (Command Prompt)

netstat -ano | findstr :31029

Windows (PowerShell)

Get-NetUDPEndpoint -LocalPort 31029

UDP probe (no reply does not prove it is closed)

nc -vzu -w 5 HOST 31029

ufw

sudo ufw deny 31029/udp

iptables

sudo iptables -A INPUT -p udp --dport 31029 -j DROP

nftables

sudo nft add rule inet filter input udp dport 31029 drop

Windows Firewall

New-NetFirewallRule -DisplayName 'Block UDP 31029' -Direction Inbound -Protocol UDP -LocalPort 31029 -Action Block

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Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.