What a connectivity rank tells you about a domain (and what it doesn't)
How harmonic centrality turns the Common Crawl web graph into a connectivity rank, how to read the number, and why it is not traffic or quality.
Guides
These guides explain how to read and check the public facts about a domain: its DNS records, the headers it sends, its certificate and its place in the web’s link graph. Each one shows the raw record or header first, says what it means and what it does not, and gives a way to check it by hand as well as with the StatsMyWeb domain report.
Articles in this section
HTTP security headers: what each one does and how to check a site's
What the six common HTTP security headers tell a browser, typical values, frequent mistakes, and how to check the headers any site sends.
How to check when an SSL certificate expires
Check when an SSL certificate expires in the browser, with openssl or curl: what notBefore and notAfter mean, and what an expiry date does not tell you.
How to find out who owns a domain: WHOIS and RDAP lookups
Find out who owns a domain with WHOIS and RDAP: what a lookup still shows, what GDPR redaction hides, and how to reach an owner when details are hidden.