Penetration Tester
Find vulnerabilities before attackers do.
Pen testers enumerate attack surface, exploit misconfigurations, and document findings. These tools help you map targets, identify weaknesses, and validate security posture — all without leaving your browser.
Start here — no account needed.
Subdomain Finder
Enumerate subdomains via certificate transparency and DNS brute-force.
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URL Scanner
Analyze links for phishing, malware, and redirect chains.
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Password Breach Checker
Check if a password appeared in a known data breach.
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CVE Lookup
Search NVD for vulnerabilities by CVE ID or affected software.
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SSL Certificate Checker
Inspect TLS certs for expiry, chain validity, and SANs.
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HTTP Headers Inspector
Identify missing security headers and misconfigurations.
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WHOIS Lookup
Domain registration and nameserver enumeration.
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Go deeper with Pro tools.
Domain Intelligence
ProFull-stack domain recon — WHOIS, DNS, SSL, subdomains, and ports.
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Vulnerability Intelligence
ProDeep CVE search with vendor, product, and severity filters.
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AppSec Console
ProAutomated application security audit with actionable findings.
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Network Scanner
ProLAN device discovery with MAC, vendor, and device type detection.
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Level up your knowledge.
Top 15 Free OSINT Tools for Network and Security Professionals
Discover the top 15 free OSINT tools for network security, IP lookup, domain analysis, DNS, and threat intelligence. Find the right tool for your workflow.
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URL Scanner Tools: How to Safely Analyze Suspicious Links Before Clicking
That email from your bank asking you to verify account details. The shortened link from an unknown sender. URL scanner tools let you analyze suspicious links in isolated environments before you click — here's how they work and what to look for.
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How to Check If an IP Address Is Malicious: A Security Engineer's Guide
When your security monitoring flags an unusual connection, getting a fast and accurate answer on whether an IP is malicious can stop an attack before it becomes a breach. Here's how to do it right.
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What Is a WHOIS Lookup and Why Security Engineers Use It
WHOIS lookups reveal who owns a domain, when it was registered, and how to reach them. Here's why that information is essential for security investigations, threat intelligence, and network operations.
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IP Geolocation Accuracy: Why Different Services Give Different Results
You run an IP through two geolocation services and get two different cities. Here's the technical reason why — and how to interpret results correctly.
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Email Security Audit Checklist: SPF, DKIM, DMARC, and Beyond
A systematic audit of SPF, DKIM, DMARC, and emerging standards like BIMI can catch misconfigurations before they become costly breaches. Here's the complete checklist security engineers rely on.
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How to Perform a Complete IP Address Audit: Step-by-Step Guide
Learn how to audit an IP address step by step — covering geolocation, ASN lookup, cloud provider detection, blacklist status, and open port scanning.
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Unlock everything
Get Pro. Use every tool, unlimited.
Pro unlocks advanced tools, removes rate limits, and gives you full access to every feature on CyrusX — for $9.99/month.