microsoft privacy developer-tools windows

Full Writeup of the Windows GDID

github.com

July 6, 2026

10 min read

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Summary

Microsoft's Global Device Identifier (GDID) is generated, stored, and transmitted as a persistent fingerprint for Windows devices. Even when not logged in with a Microsoft Account (MSA), a GDID is still assigned, utilizing an anonymous device path for identification.

Key Takeaways

The Global Device Identifier (GDID) is a 64-bit unique identifier assigned to a Windows installation when it registers with a Microsoft Account.
A reinstall of Windows results in a new GDID, indicating it is not derived from hardware serial numbers.
The GDID is generated by the Microsoft Account service and stored in the registry, with its usage documented in a U.S. federal criminal complaint.
The GDID is reported by the Delivery Optimization service and is part of the Connected Devices Platform architecture.

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Coverage & discussions

Hacker News · github.com

Full Writeup of the Windows GDID ↗

Community discussions

Hacker News discussion ↗

Historical count: 5 · 5 saved in sample · Historical sample

Analysis ready

Community Sentiment

Mixed

Positives

The GDID's stability as a unique identifier could be a game-changer for device attribution in legal cases, reducing ambiguity in court.
Some commenters appreciate the technical distinction between GDID and GUID, showcasing the community's engagement with the underlying technology.

Concerns

There's a strong sentiment that the use of GDID for tracking feels invasive, with many questioning its legitimate applications beyond law enforcement and targeted ads.
Skepticism looms over the accuracy of the GDID details presented, with claims that the supposed telemetry is unconfirmed and potentially misleading.