Check domain names, DNS records, email setup, SSL certificates and redirects - the everyday checks of running a website.
Check if a domain is free across .com, .net, .io and more at once - and see who owns the taken ones and when they expire.
See a domain's DNS records - A, AAAA, CNAME, MX, TXT, NS, CAA, SOA - looked up live, right in your browser.
Check a domain's email setup - MX, SPF, DMARC and DKIM - and see in plain words what's missing or wrong.
Check a site's SSL certificate: who issued it, when it expires, which names it covers and whether browsers trust it.
Follow a URL's redirects hop by hop (301, 302 ...) and see each response's headers, timing and security headers.