Most VPN users assume that once their public IP address changes, their real connection is hidden.

That is mostly true.

But not always.

While testing different VPN configurations, I noticed something interesting:

my public IP had changed correctly,

the VPN tunnel appeared to be working,

DNS looked normal,

but the browser was still exposing network information through WebRTC.

That is a problem, because modern VPN detection is no longer based only on the visible public IP address.

Websites can combine multiple signals together:

public IP address,

ASN and hosting provider,

DNS behavior,

browser timezone,

IPv6 exposure,

WebRTC candidates,

proxy or datacenter reputation.

A VPN can hide one part of your connection while your browser leaks another.

What is WebRTC?

WebRTC stands for Web Real-Time Communication .

It is a browser technology used for real-time features such as:

video calls,

voice chat,

screen sharing,

peer-to-peer data transfer.

It is built into most modern browsers,…