Two quick lookups in one free toolkit. Enter any website address to see the technology behind it (CMS and version, JavaScript libraries, web server, CDN, analytics), plus HTTPS, HSTS and mobile-readiness. Or check whether a domain name is available and see its registrar, registration and expiry dates, nameservers and DNS records. Free, no sign-up. Lookups read only public information; detection is an estimate and not always complete.