gcdn.2mdn.net: Google DoubleClick Tracker Unveiled | Privacy Auditor
- Privacy Auditor Research Team
- Privacy , Trackers
- January 20, 2026
Table of Contents
gcdn.2mdn.net: Google DoubleClick Spies on Your Ad Clicks
The gcdn.2mdn.net domain belongs to Google’s DoubleClick network, designed to track your ad interactions and build a profile of your interests. This invades your privacy for the sake of targeted advertising. Let’s dive into its tracking tactics and how to resist.
What Is gcdn.2mdn.net?
DoubleClick is Google’s ad-serving platform, and gcdn.2mdn.net delivers ad content while logging your behavior. It monitors clicks and impressions to refine ad targeting, disregarding your privacy. As Privacy Auditors, we’re alarmed by this pervasive surveillance.
Data It Collects
When you encounter an ad served by this domain, it captures:
- IP Address: Links to your physical location through network data.
- Ad Interaction Data: Records clicks, impressions, and specific ad IDs.
- Cookie IDs: Uses ‘_gads’ to track you across websites.
- Device ID: Grabs GAID/IDFA for mobile tracking.
- Geolocation: Estimates location via IP or GPS.
- Browsing History: Logs sites tied to ad exposure.
- User-Agent: Captures browser/OS like ‘Safari 17.0’.
- Referrer URL: Notes where you clicked the ad from.
This creates a detailed ad profile, stripping away your anonymity.
Who Gets Your Data?
Your data is distributed to:
- Google’s Real-Time Bidding System: Shares geolocation and device ID with an adtech company.
- Third-Party Advertiser: Entities in Google’s ad network.
- Government Entity: Per Google’s 2024 transparency report, data like IP is shared in 80% of U.S. legal requests.
How to Protect Yourself
Privacy Auditors are committed to your digital safety. Block gcdn.2mdn.net with:
- Tracker Blockers: Use Privacy Auditor tools to halt ad scripts.
- VPN Services: Hide your IP with Mullvad.
- Privacy Browsers: Opt for Firefox with tracking protection.
- Cookie Management: Clear cookies to break tracking links.
Layer these defenses to minimize exposure to ad trackers.
Sources
- Google Privacy Policy: https://policies.google.com/privacy
- DoubleClick Documentation: https://support.google.com/dfp_premium
Warning
The gcdn.2mdn.net tracker grabs invasive data like your IP address and ad interactions. Shield yourself with Privacy Auditor’s blockers and a VPN.
This is a legal disclaimer. All information is provided for educational purposes only.
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