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Documentation Index

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Internet-wide scan engines continuously probe billions of IP addresses, fingerprinting the services they expose and archiving the results in searchable databases. Security researchers, penetration testers, and defenders use these tools to discover internet-facing assets, identify unpatched software, locate misconfigured devices, and understand the global exposure landscape — all without sending a single packet to a target themselves. From industrial control systems to home routers, these platforms provide unparalleled visibility into what’s actually running on the public internet.

Shodan

Search Engine for the Internet of Everything — the original and most widely used internet-wide scanner.

Censys Search

Search engine for every server on the Internet to reduce exposure and improve security.

Onyphe.io

Cyber Defense Search Engine for open-source and cyber threat intelligence data.

ZoomEye

Global cyberspace mapping platform with extensive device and service fingerprinting.

GreyNoise

The source for understanding internet noise — separates malicious scanners from benign activity.

Natlas

Scaling Network Scanning — open-source distributed scanning infrastructure.

Netlas.io

Discover, Research and Monitor any Assets Available Online.

FOFA

Cyberspace mapping platform widely used across Asia-Pacific security research communities.

Quake

Cyberspace surveying and mapping system from 360 Security Group.

Hunter

Internet Search Engines For Security Researchers — fast and developer-friendly.

ODIN

One of the most powerful search engines for Scanned Internet Assets.

Modat Magnify

The Largest Internet Device DNA Dataset Available — deep device fingerprinting at scale.

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Use Cases

Internet-wide scan databases are indispensable during the reconnaissance phase of any security engagement. Common use cases include finding exposed services such as open databases, remote desktop endpoints, or unprotected admin panels; identifying misconfigured devices including IoT sensors, industrial control systems, and network appliances running outdated firmware; and performing internet-wide scanning research to understand attack trends, measure patch adoption rates, or detect newly published vulnerabilities at scale. Defenders use these same tools to audit their own perimeter — discovering shadow IT, forgotten dev servers, or cloud misconfigurations before attackers do.
Shodan, Censys, and FOFA are the most widely used. Start with free tiers and upgrade for advanced filters and higher query limits.

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