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Windows Defender Security Intelligence (WDSI)

Microsoft's security intelligence portal for reporting malicious URLs and checking Windows Defender threat assessments.

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Official docs ↗

Platforms: Web · Last verified September 7, 2026

Microsoft’s security intelligence portal for reporting malicious URLs and checking Windows Defender threat assessments.

Only use this tool against systems you own or are explicitly authorized to test — see the disclaimer.

Getting started

Best for: Reporting malicious sites to Microsoft and checking URL threat status. See the official site linked above for details.