Website technology lookup
Website tech stack checker
Check a domain for framework, CMS, hosting, CDN, analytics, DNS, HTTP, SSL, WHOIS, and creator signals in one scan.
Frontend and CMS
Frameworks, CMS generators, build tools, scripts, HTML markers, and page metadata.
Infrastructure
Hosting provider, CDN, DNS records, IP network, name servers, and email provider clues.
HTTP and SSL
Server headers, notable response headers, SSL issuer, certificate organization, and dates.
Ownership context
WHOIS, registrar, creator metadata, about-page credits, footer links, and public org data.
What the tech stack tells you
A website stack often points to how a site was built and maintained. Headers can identify servers and platforms, HTML can expose frameworks or generators, DNS can reveal hosting and email providers, and SSL/WHOIS records can add organization context.
WhosBuilt is useful when you are researching competitors, checking vendor choices, validating a lead, or trying to understand who owns and operates a site before reaching out.
Common use cases
- Audit a competitor's website platform
- Find likely hosting and CDN providers
- Validate vendor claims before outreach
- Collect technical context before rebuilding a site
If you are trying to identify the person, agency, or company behind a site, start with who built this website.