Api.c99.nl (Domain) Investigation Report
Generated on Feb 16, 2026
Why we think so?
api.c99.nl is an API service offering over 57 endpoints including Skype resolver, weather data, email-to-Skype lookup, IP geolocation, and subdomain finding. It sees modest monthly traffic around 2,600 to 4,000 visits mainly from US and India and has a bounce rate of about 57%. The service is frequently cited positively in cybersecurity circles for tasks like penetration testing and subdomain scanning. No scam reports, phishing flags, or blacklists mention api.c99.nl. It holds a valid SSL certificate and publishes clear contact information, including support@c99.nl. Trademark searches do not indicate conflicts for "c99" related marks. There are no public lawsuits or disputes found. While it appears legitimate and used by security professionals, user reviews are scarce likely due to its niche developer focus.
Risk Insights
Consistent Niche Usage
- 2,600-4,000 monthly visits
- Main traffic from US and India
- Bounce rate at ~57%
No Scam or Blacklist Flags
- Clear of Google Safe Browsing warnings
- Not on crypto scam lists
- No phishing or blacklist matches
Category Scores
Red Flags & Warnings
- Traffic volume is modest, which might reflect a niche user base rather than broad adoption.
Detailed Checks & Insights
0-100 Scale
Domain Technical and Traffic Signals
Score: 85
Domain Technical and Traffic Signals
"Visits range from about 2,600 to nearly 4,000 per month; US and India are key visitor countries."
Reason: Traffic volume is consistent with a niche service, with diverse global users and normal bounce rates.
Contact and Identity Verification
Score: 90
Contact and Identity Verification
"Support email support@c99.nl is widely referenced; SSL certificate is valid with recent issuance."
Reason: Domain publishes real contact info including support email and phone numbers.
Blacklist and Scam Report Checks
Score: 95
Blacklist and Scam Report Checks
"The domain appears clean in multiple independent blacklist sources."
Reason: No listing found in Google Safe Browsing, crypto scam lists, or phishing blacklists.
Trademark and Legal Examination
Score: 80
Trademark and Legal Examination
"Standard terms of service with jurisdiction in Tuvalu, no adverse legal history as of the latest data."
Reason: USPTO trademark search shows no active conflicts; no public lawsuits found.
Reputation and Customer Feedback
Score: 75
Reputation and Customer Feedback
"Mentioned in penetration testing and OSINT tool lists; limited consumer-facing feedback due to niche."
Reason: Highly regarded by cybersecurity community; no consumer complaints found but lacks broad user reviews.
Content and Service Description Validity
Score: 85
Content and Service Description Validity
"No contradictory information in public technical descriptions or promotional content."
Reason: Clear and consistent service description across source data; APIs cover multiple cybersecurity functions.
Your Next Steps
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1
Test the API with a trial key to assess responsiveness and functionality for your specific needs.
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2
Monitor community forums like GitHub issues and Hacker News for user experiences and emerging reports.
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3
Check independent threat databases such as VirusTotal periodically for updated safety assessments.
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4
Contact support using support@c99.nl for direct questions or clarifications.
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5
Review the API documentation and terms of service at api.c99.nl to confirm compliance with your use case.
Key Evidence & Citations
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GitHub - c99 API wrapper
⤷ GitHub repository with usage examples confirming API legitimacy and developer support.
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SimilarWeb Analytics for api.c99.nl
⤷ Traffic and engagement metrics showing stable usage and diverse geographic visitors.
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USPTO Trademark Search Results for 'c99'
⤷ No active trademark conflicts or live status marks indicating brand safety.
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Crypto Scam Sniffer Blacklist Check
⤷ Negative result indicating no blacklisting for this domain.
📌 More checks:
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