DNS Lookup
Check DNS records, SSL certificate, WHOIS data, redirect chain, HTTP headers, hosting provider, and email provider for any domain — all in one lookup.
What is a DNS lookup?
DNS (Domain Name System) translates human-readable domain names into IP addresses that computers use to communicate. A DNS lookup queries these records to reveal how a domain is configured — including which servers host it (A/AAAA records), where email is routed (MX records), which nameservers are authoritative (NS records), and verification/security policies (TXT records like SPF, DKIM, and DMARC).
Why check SSL certificates?
SSL/TLS certificates encrypt the connection between a browser and a web server. An expired or misconfigured certificate causes browser warnings that drive visitors away and hurt search rankings. Regularly checking your SSL certificate expiry date, issuer, and Subject Alternative Names helps prevent outages and ensures your site remains secure and trusted.
Understanding redirect chains
When you type a URL, the server may redirect you through multiple hops before reaching the final page. Common redirects include HTTP to HTTPS upgrades, www to non-www normalization, and marketing URL shorteners. Long redirect chains add latency and can dilute SEO link equity. This tool traces every hop so you can identify and eliminate unnecessary redirects.
How we detect hosting & email providers
Hosting detection combines reverse DNS lookups on the domain's IP addresses with analysis of HTTP response headers (like the Server header, CDN identifiers, and platform-specific headers). Email provider detection works by analyzing MX records — the DNS entries that specify which mail servers handle email for a domain — and matching them against known provider patterns.
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