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Domain Due Diligence
Report for Guide.duo.com

Report Date November 17, 2025
Recommendation
Proceed
Overall Summary
Safe
Why we think so

guide.duo.com is an official documentation and support site for Duo Security's authentication services, widely used for two-factor authentication. It receives moderate monthly traffic (~265,000 visits in October 2025), primarily from the US and other countries including Ghana, Canada, and India. The site is not transactional and does not facilitate payments or sensitive exchanges directly. There are no reports or credible claims of guide.duo.com being used as a scam or fraudulent site. However, Duo's authentication system is sometimes targeted by phishing attacks that trick users into approving unauthorized access via Duo push notifications, which may result in account compromise and external financial fraud, but not due to any fault of this site. The domain has a valid SSL certificate and good web reputation with no listing on blacklists or security warnings.

Confidence Score
85%

Risk Insights

🛡️

Official Duo Documentation Site

Valid SSL and standard DNS setup
Steady, legitimate monthly traffic
No detected malware or phishing
⚠️

Target of Phishing, Not Source

Phishing scams exploit Duo's authentication flows
Guide.duo.com is not involved in scams
Users should stay vigilant with authentication requests

Contradictory Signals

Phishing attacks exploit Duo methods but do not implicate this official documentation domain

Signal A: No direct scam or fraud implicating guide.duo.com

Signal B: Reports of phishing targeting Duo authentication

Category Scores

Identity 85/100
Reputation 90/100
Technical 80/100
Content 88/100
Legal 75/100
Business Validity 85/100

Red Flags & Warnings

  • Phishing scams target Duo authentication methods but do not involve guide.duo.com directly.

🔎 Detailed Checks & Analysis

Domain and Infrastructure Validity

Score: 90/100
Passed

"The SSL cert issued recently with RSA-SHA256 signature supports secure communication."

Reason: Valid SSL certificate and normal DNS records confirm domain legitimacy.

Reputation and Traffic Analysis

Score: 85/100
Passed

"Bounce rate is typical for help/documentation sites; high direct and search traffic ratios suggest legitimate use."

Reason: Moderate, steady traffic mainly from the US with no signs of suspicious spikes.

Blacklist and Security Threat Status

Score: 100/100
Passed

"Site appears safe with no detected malware or phishing flags in security databases."

Reason: No listings on Google Safe Browsing or crypto scam blacklists.

Content Authenticity and Branding

Score: 85/100
Passed

"USPTO trademark checks confirm Duo branding ownership unrelated to scams."

Reason: Content matches official Duo documentation style and duplicated on known trusted sites.

User Reviews and Scam Reports

Score: 80/100
Passed

"Reports of Duo system phishing scams exist but do not implicate this domain directly."

Reason: No credible scam or fraud reviews found for guide.duo.com.

Legal and Customer Disputes

Score: 75/100
Passed

"Duo Security maintains standard legal frameworks but no disputes linked to this site."

Reason: No known legal issues or customer disputes involving guide.duo.com domain.

Your Next Steps

  • 1
    Use guide.duo.com solely for official Duo Security documentation and support.
  • 2
    Always verify Duo authentication requests independently before approving to avoid phishing.
  • 3
    Avoid entering Duo codes or approving push notifications you did not expect.
  • 4
    Report suspicious Duo authentication prompts to your organization's IT security team.
  • 5
    Keep software and security systems updated to protect against phishing and social engineering.
  • 6
    Access the site via direct URLs or trusted links to prevent visiting spoofed pages.

Evidence & Citations

🕵🏻 Keep investigating

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