id5-sync.com: Identity Sync Tracker Revealed | Privacy Auditor
- Privacy Auditor Research Team
- Privacy , Trackers
- October 17, 2025
Table of Contents
id5-sync.com: Syncing Your Identity for Ad Targeting
The tracker id5-sync.com, operated by ID5, focuses on syncing user identities across advertising platforms. This invasive process builds detailed profiles for precise ad targeting, eroding your privacy with every interaction. Here’s what it does and how to resist it.
What Is id5-sync.com?
ID5 runs id5-sync.com to connect user identities across websites and devices, enabling advertisers to target you with uncanny accuracy. It thrives in cookieless environments, making it a persistent threat to your online anonymity.
Data It Collects
This tracker captures:
- User ID: Links your activities across multiple sites.
- Device ID: Identifies your specific device for tracking.
- IP Address: Pinpoints your general location.
- Browser Fingerprint: Records unique browser settings.
- Cookie Data: Stores IDs for ongoing surveillance.
This data forms a comprehensive profile, ripe for ad exploitation.
Who Gets Your Data?
Your information is shared with:
- Adtech Company: Uses ID5 for identity resolution in real-time bidding.
- Publisher: Integrates ID5 to monetize through targeted ads.
- Third-Party Partner: Accesses data within the advertising ecosystem.
How to Protect Yourself
Take control of your privacy with these steps:
- Block Trackers: Use Privacy Auditor to disable
id5-sync.comscripts. - Clear Cookies: Erase tracking IDs regularly.
- Use a VPN: Hide your IP with a tool like Mullvad.
- Opt Out: Check ID5’s privacy page for opt-out options, though effectiveness varies.
Stack these defenses to minimize exposure.
Sources
- ID5 Privacy Policy: https://id5.io/privacy-policy/
- ID5 News on Cookieless Solutions: https://news.id5.io/2023/05/25/pubmatic-and-havas-media-leverage-id5-id-to-help-brands-exceed-in-cookieless-environments/
Warning
The id5-sync.com tracker grabs invasive data like your user ID and device ID. Protect 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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