Guides
Understand domain data, DNS records, SSL certificates, website performance and detectable technologies, and learn how to interpret tool results. These guides explain what each check tells you and where to look when something needs attention.
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SSL certificate checks: expiry, hostnames and trust
Read certificate validity and hostname results, understand certificate chains, and investigate common HTTPS problems before checking a fix.
Read the SSL certificate guide → -
Domain lookup: registration, DNS and website status
Interpret registration dates and statuses, separate website and email DNS records, and use HTTP responses to troubleshoot domain problems.
Read the domain lookup guide → -
Website performance: lab tests and Core Web Vitals
Read Lighthouse and real-user reports, distinguish loading from responsiveness and visual stability, and choose the next diagnostic step.
Read the website performance guide → -
Website technology: platforms, libraries and public signals
Identify publicly detectable technologies, read categories and versions, and understand what a fetched response can reveal about a website.
Read the website technology guide →