OSINT guides
Practical, step-by-step guides to open-source research: verifying images, investigating domains and email, searching usernames responsibly, and preserving evidence.
- What Is OSINT? A Practical Beginner's GuideWhat open-source intelligence is, who uses it, the basic research cycle, and the legal and ethical lines every beginner should know.
- How to Find Subdomains of a Website (Passive OSINT Methods)Find a domain's subdomains without scanning it: certificate transparency logs, passive DNS sources, and how to verify and document what you find.
- How to Check If an Image Is Fake, Edited, or Out of ContextA step-by-step image verification workflow: reverse image search, metadata, forensic analysis, and geolocation clues — plus the limits of each method.
- Username Search: How to Find Accounts Across Sites (and Avoid False Matches)How username enumeration tools like Sherlock, Maigret, and WhatsMyName work, how to run them, and how to avoid wrongly linking accounts to a person.
- How to Investigate a Suspicious Email AddressCheck whether an email address is risky or part of a phishing attempt: reputation lookups, breach exposure, header analysis, and domain checks.
- How to Archive a Web Page as Evidence (Before It Disappears)Preserve web pages reliably with archive.today, the Wayback Machine, and SingleFile — and document captures so they hold up later.