Free hosting & DNS tools

DNS Lookup Look up the DNS records of any domain: IPv4 (A), IPv6 (AAAA), nameservers (NS) and mail servers (MX). Resolved against authoritative resolvers and cached for one hour. WHOIS Lookup Look up domain registration data via RDAP/WHOIS: registrar, creation/expiry/updated dates and domain status. SSL Certificate Checker Inspect a site's TLS certificate: issuer, validity window, TLS version and the domains it covers (SANs). HTTP Header Checker See the HTTP response headers a website returns: status, server software, X-Powered-By, HTTP version and more. Reverse IP Lookup Resolve a domain to its IP, then find other domains hosted on the same address. Useful for spotting shared hosting and site networks. Nameserver Checker Find the authoritative nameservers (NS records) of any domain — often the quickest way to tell which DNS or hosting provider runs it. CDN Checker Detect whether a website is served through a CDN or WAF such as Cloudflare, Fastly, Akamai, BunnyCDN, KeyCDN or Vercel. WordPress Detector Check whether a website is built with WordPress (or another CMS / framework) by inspecting its response headers and markup. Technology Stack Checker Detect the technology behind a website: CMS or framework, web server, CDN and powered-by signals — all from one request.