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Port 19302Google Talk Voice & Video

Port 19302 is primarily used by Google Talk services for establishing voice and video call connections. It's widely utilized in Google's WebRTC infrastructure, which enables browsers and mobile applications to communicate in real-time using peer-to-peer connections. This port is essential in facilitating media negotiation and relay through Google's STUN servers, helping traverse NATs and firewalls for seamless user experience..

inNetwork ServicesVoice and ChatMedia
transport
udp

single transport

in transit
cleartext

payload readable on path

assignment
unofficial

used by convention

risk
4/10

caution

lookups
19,283

rank 133 of 993 · top 13%

Technical Details

what runs on :19302

Port 19302 serves as a key component within Google’s WebRTC signaling and media relay framework. It supports the traversal of NAT (Network Address Translation) devices by enabling clients to contact Google-operated STUN (Session Traversal Utilities for NAT) servers. These servers help clients discover their public IP addresses and network conditions, facilitating connection setup for real-time media streams.

When initiating a voice or video call through services such as Google Hangouts, Google Chat, or other applications utilizing Google’s WebRTC backend, client applications use UDP on port 19302 to communicate with these STUN servers. This assists in negotiating ICE (Interactive Connectivity Establishment) candidates that allow a peer-to-peer connection to be established whenever possible, or to fall back to relay servers (TURN) if direct communication is blocked.

Since WebRTC is deeply embedded in many modern communication applications, port 19302 has become a default signaling port for negotiating media paths. It predominately handles ICE negotiation messages and assists media traversal rather than directly carrying media content. This port is unofficial but extensively used across Google’s communication products.

Security Information

exposure of :19302

risk score

4/ 10caution

worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.

network services averages 3.9 across 604 ports — this one sits 0.1 above.

in transit

cleartext

credentials and payloads are readable by anyone on path

assignment

unofficial

used by convention, not registered — what answers here varies by deployment

reachable over

udp

udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite

security overview

Common vulnerabilities:

  • Since UDP is connectionless, open port 19302 may be subject to exploitation through spoofed requests, reflection, or amplification attacks.
  • Exposure of STUN traffic could provide insights into internal network structures, potentially aiding an attacker in reconnaissance.
  • Misconfigured or unrestricted firewall rules around this port may allow unwanted connection attempts, increasing attack surface.

Common mitigations:

  • Implement stateful firewall rules to allow UDP traffic on port 19302 only to and from known Google server IP ranges.
  • Monitor connection attempts and rate-limit or filter anomalous or abusive behaviors.
  • Employ secure NAT traversal techniques and encryption at the application level via DTLS-SRTP to protect media streams negotiated through this port.
  • Regularly audit access policies and close unnecessary open UDP ports to minimize attack surface.

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risk mix of the 8 listed

  • caution100%

0 of 8 encrypted