Port 19302 (Google STUN)

Port of Google's public STUN servers (stun.l.google.com:19302), used in countless WebRTC examples.

Registered (user) port, 1024-49151 UDP Voice, video and chat Meant to face the internet

Port 19302 is normally used over UDP; the checker tests TCP only, so a "filtered" result does not mean the UDP service is down.

What port 19302 is used for

Port of Google's public STUN servers (stun.l.google.com:19302), used in countless WebRTC examples.

Meant to face the internet. Outbound only; WebRTC can reveal local IPs to web pages.

Port 19302 is in the registered range and has no IANA assignment. The usage above is unofficial but widespread.

Linux: UDP 19302

sudo ss -ulnp 'sport = :19302'

Linux / macOS: which process owns the port

sudo lsof -nP -i :19302

Windows (Command Prompt)

netstat -ano | findstr :19302

Windows (PowerShell)

Get-NetUDPEndpoint -LocalPort 19302

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

nc -vzu -w 5 HOST 19302

ufw

sudo ufw allow 19302/udp

iptables

sudo iptables -A INPUT -p udp --dport 19302 -j ACCEPT

nftables

sudo nft add rule inet filter input udp dport 19302 accept

Windows Firewall

New-NetFirewallRule -DisplayName 'Allow UDP 19302' -Direction Inbound -Protocol UDP -LocalPort 19302 -Action Allow

All port numbers · Open port checker
Assignment data: IANA port number registry (public domain), retrieved 2026-11-10.