Analyze any domain in seconds. DNS records, SSL certificate, WHOIS, security headers audit, and tech stack detection — all in one lookup.
Analyze up to 25 domains at once. Get a downloadable CSV with SSL, security, DNS, tech stack, and WHOIS data for every domain.
Integrate domain analysis into your own apps. Same data, programmatic access.
curl "https://useful-patch.com/tools/domain-lookup/api/lookup?domain=stripe.com"
GET /api/lookup?domain=X Full intelligence reportGET /api/dns?domain=X DNS records onlyGET /api/ssl?domain=X SSL certificate detailsGET /api/headers?domain=X Security headers auditGET /api/tech?domain=X Tech stack detectionGET /api/whois?domain=X WHOIS informationFree tier: 15 lookups/hour. Need more? API plans starting at £29/mo coming soon.
A, AAAA, MX, NS, TXT, CNAME, SOA, and CAA records — all in one view.
Issuer, expiry date, SAN domains, protocol version, and expiry warnings.
Grade your site's security headers: HSTS, CSP, X-Frame-Options, and more.
Detect CDN, hosting, email provider, frameworks, and CMS from DNS and headers.
Registration date, registrar, expiry, nameservers, and domain age.
No signup needed. Results in seconds. 15 free lookups per hour.
Enter any domain name above and click "Analyze" to get a comprehensive intelligence report. The tool checks DNS records, SSL certificates, security headers, WHOIS registration data, and detects the technology stack — all from a single lookup.
View all DNS records for any domain including A records (IPv4), AAAA records (IPv6), MX records (mail servers), NS records (name servers), TXT records (SPF, DKIM verification), CNAME records, SOA records, and CAA records (certificate authority authorization). Useful for debugging email delivery issues, verifying DNS configuration, and understanding domain infrastructure.
Instantly check if a domain's SSL certificate is valid, who issued it, when it expires, and how many days remain. The tool also shows Subject Alternative Names (SANs) and the TLS protocol version. Essential for monitoring certificate expiry and ensuring HTTPS is properly configured.
Get a security grade (A+ to F) based on HTTP security headers. We check for Strict-Transport-Security (HSTS), Content-Security-Policy (CSP), X-Content-Type-Options, X-Frame-Options, Referrer-Policy, Permissions-Policy, and more. Also detects if the server exposes version information through Server or X-Powered-By headers.
Discover what technologies a domain uses — from CDN (Cloudflare, CloudFront) and hosting platform (Vercel, Netlify, AWS) to email provider (Google Workspace, Microsoft 365) and web framework (Express, Next.js, WordPress). Detection uses DNS records, HTTP headers, and response signatures.
Look up domain registration details including registrar, creation date, expiry date, nameservers, and domain age. Useful for checking domain history, verifying ownership, and investigating suspicious domains.
Yes — the web tool is completely free with no signup required. You get 15 lookups per hour. For higher volume programmatic access, API plans are available.
We don't store your queries or results. Each lookup is performed in real-time and the data is returned directly to your browser.
Tech detection is based on DNS records and HTTP response headers, which provides high confidence for infrastructure-level technologies (CDN, DNS, email, hosting). Client-side framework detection requires page content analysis, which is not currently included in the free tier.
Yes! The API returns JSON and can be called from any language. Free tier allows 15 requests/hour. Contact us for higher volume plans.