Domain / Whois Lookup
Get a comprehensive domain intelligence report including DNS records, nameservers, IP addresses, SSL certificate details, and more. Powered by Google DNS and crt.sh APIs — no server-side processing required.
Domain Lookup
Enter a domain name to generate a full report. We query public DNS and certificate transparency APIs.
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Browser-based WHOIS queries are limited. Use these services for complete WHOIS data:
About Domain Lookups and WHOIS
A domain lookup provides essential information about a domain name's configuration, ownership, and infrastructure. This tool combines data from multiple public APIs to build a comprehensive domain intelligence report without requiring any server-side processing. All queries are made directly from your browser to public DNS and certificate transparency services.
DNS Records Explained
The Domain Name System (DNS) translates human-readable domain names into IP addresses and other machine-readable data. A records map a domain to IPv4 addresses, while AAAA records map to IPv6. NS records identify the authoritative nameservers for a domain. MX records specify mail servers that accept email for the domain, with priority numbers indicating preference. TXT records store arbitrary text, commonly used for SPF, DKIM, DMARC, and domain verification.
Nameserver Analysis
Nameservers are critical infrastructure components that respond to DNS queries for a domain. Examining nameservers reveals the DNS hosting provider (e.g., Cloudflare, AWS Route 53, Google Cloud DNS). Most domains have at least two nameservers for redundancy. Misconfigured or missing nameservers can cause complete domain outages, making NS record monitoring essential for DevOps teams.
SSL Certificate Transparency
Certificate Transparency (CT) is a public logging framework for monitoring and auditing SSL/TLS certificates. All publicly trusted Certificate Authorities must submit certificates to CT logs. This tool queries crt.sh, a popular CT log search engine, to find certificates issued for the queried domain. This reveals the certificate issuer, validity period, and any subdomains with certificates.
What is WHOIS?
WHOIS is a query-and-response protocol used to look up domain registration information, including the registrant, registrar, registration dates, and nameservers. Due to browser security restrictions (CORS), direct WHOIS queries cannot be made from a web page. This tool provides DNS and SSL information directly, and links to external WHOIS services for complete registration data.
Google DNS API
This tool uses Google's public DNS-over-HTTPS (DoH) API at dns.google to resolve DNS records. The API returns JSON responses and supports all standard record types. It provides the same results as querying Google's public DNS servers (8.8.8.8 and 8.8.4.4) but over a secure HTTPS connection with CORS support, making it ideal for browser-based tools.
Security and Privacy Applications
Domain lookups are essential for security investigations, phishing detection, and infrastructure auditing. Checking DNS records can reveal domain hijacking (unexpected A records), email spoofing risks (missing SPF/DMARC), and unauthorized certificates (via CT logs). DevOps teams use these lookups to verify DNS propagation after changes, troubleshoot email delivery, and audit their domain's public-facing configuration.
100% Client-Side Processing
All lookups in this tool are performed directly from your browser. DNS queries go to Google's public DNS API, and certificate lookups go to crt.sh. No data passes through SecureBin servers. Your domain queries and results remain private to your browsing session.