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Censys logo featuring three overlapping orange circles and the brand name in black text.

Censys is a search engine that allows security professionals to discover, monitor, and analyze internet-connected devices and networks. Think of it as a Google for the internet's infrastructure. Founded by researchers at the University of Michigan, Censys continuously scans the internet, collecting data on servers, websites, and other devices. This information is then indexed and made searchable through its platform, providing a comprehensive view of the global internet landscape. Censys is built upon a mission to improve internet security by providing the most accurate and complete data about internet-connected devices. This data empowers security teams to identify vulnerabilities, assess risks, and ultimately, strengthen their overall security posture.

Key Features

Censys boasts a powerful suite of features designed to empower security professionals:

  • Comprehensive Internet Scanning: Continuously scans the IPv4 and IPv6 internet address spaces, collecting data on exposed services, certificates, and vulnerabilities.

  • Detailed Device Information: Provides rich data on each discovered device, including IP addresses, domain names, open ports, software versions, TLS certificate details, and geographic location.

  • Advanced Search Capabilities: Offers a powerful query language allowing users to search for specific devices and services based on various criteria.

  • Vulnerability Detection: Identifies known vulnerabilities in exposed services, allowing organizations to prioritize remediation efforts.

  • Attack Surface Discovery: Helps organizations discover and map their entire attack surface, including shadow IT assets and forgotten infrastructure.

  • Real-time Monitoring and Alerting: Enables users to monitor changes in their attack surface and receive alerts when new vulnerabilities or misconfigurations are detected.

  • API Integration: Provides a robust API for integrating Censys data with other security tools and workflows, enabling automation and streamlined security operations.

  • Data Export: Allows users to export data in various formats for further analysis and reporting.

Use Cases or Applications

Censys offers a wide range of applications for security professionals:

  • Vulnerability Management: Identify and prioritize vulnerabilities in exposed systems and applications. Censys helps security teams proactively address potential weaknesses before they can be exploited by attackers.

  • Attack Surface Management: Discover and map all internet-facing assets, including cloud infrastructure, web applications, and IoT devices. This provides a comprehensive view of an organization's attack surface, enabling better risk management.

  • Threat Hunting: Proactively search for malicious activity and identify compromised systems. Censys provides valuable intelligence on attacker infrastructure and techniques.

  • Incident Response: Rapidly identify and assess the scope of security incidents. Censys data can help incident responders understand how an attack occurred and what systems were affected.

  • Security Research: Conduct research on internet security trends and vulnerabilities. Censys provides a unique platform for studying the global internet landscape.

  • Supply Chain Security: Assess the security posture of third-party vendors and partners. Censys can help organizations identify vulnerabilities in their supply chain and mitigate associated risks.

What is Unique About Censys?

Several factors distinguish Censys from other internet scanning and security intelligence platforms:

  • Accuracy and Completeness: Censys prioritizes data accuracy and completeness through its rigorous scanning methodology and data validation processes. It actively verifies where to scan, focusing on independent measurement and research to ensure accurate data, even when services are running on non-standard ports. This helps avoid false positives and provides a more reliable view of the internet landscape.

  • Independent Measurement and Research: Censys employs its own scanning infrastructure and research team to collect and analyze data. This independence ensures unbiased and objective results. As demonstrated by their approach to identifying services running on non-standard ports, like Modbus, Censys uses active investigation rather than passive scanning.

  • Focus on Internet-Wide Visibility: Censys aims to provide a comprehensive view of the entire internet, rather than focusing on specific regions or industries. This global perspective is valuable for understanding internet security trends and identifying emerging threats. The Censys search provides some good resources.

  • Powerful Query Language: Censys offers a flexible and expressive query language that allows users to search for specific devices and services based on a wide range of criteria. This enables users to tailor their searches to their specific needs and interests.

Who Should Use Censys?

Censys is a valuable tool for a wide range of security professionals, including:

  • Security Engineers: For vulnerability management, attack surface reduction, and incident response.

  • Security Researchers: For studying internet security trends and identifying emerging threats.

  • Threat Intelligence Analysts: For gathering intelligence on attacker infrastructure and techniques.

  • Incident Responders: For rapidly identifying and assessing the scope of security incidents.

  • Network Administrators: For monitoring network security and identifying misconfigurations.

  • CISOs and Security Managers: For gaining visibility into their organization's attack surface and managing cybersecurity risk.

  • Red Teamers: For reconnaissance and identifying potential attack vectors.

Supported Platforms & Installation

Censys is a cloud-based platform, so there is no software to install. Users can access Censys through a web browser or through its API. To get started with Censys:

  1. Visit the Censys website: Go to censys.com.

  2. Create an account: Sign up for a free or paid account.

  3. Explore the platform: Use the Censys search engine or API to start exploring the internet landscape.

  4. Review documentation: Consult the Censys documentation for detailed information on features, usage, and API integration.

Pricing

Censys offers a range of pricing plans to meet the needs of different users. A free community account provides limited access to Censys data and features. Paid plans offer more comprehensive data, advanced search capabilities, API access, and dedicated support. Pricing varies depending on the number of users, data usage, and features required. Contact Censys directly for specific pricing information.

Short Summary

Censys empowers security professionals with unparalleled visibility into the internet's attack surface. By providing comprehensive, accurate, and timely data on internet-connected devices and networks, Censys helps organizations proactively manage their security risks, identify vulnerabilities, and respond effectively to security incidents. Its unique scanning methodology, powerful search capabilities, and API integration make it a valuable tool for any organization serious about cybersecurity. By enabling targeted scanning based on in-depth research, Censys avoids the noise of generic sweeps, allowing security teams to quickly pinpoint and address critical vulnerabilities before they can be exploited. Understanding common internet terms can help get the most out of Censys.

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