About LDNS
A comprehensive, client-side DNS lookup and domain analysis tool that runs entirely in your browser with no backend dependencies.
What LDNS Offers
DNS Records Analysis
Complete DNS lookup with clickable record filtering, export capabilities, and real-time validation.
Email Configuration
SPF, DMARC, MTA-STS, and BIMI analysis with provider detection and security recommendations.
RDAP/WHOIS Data
Domain registration info, DNSSEC status, registrar details, and expiration tracking.
Export & Share
Export data as JSON, CSV, BIND zone files, or generate PDF reports for documentation.
100% Client-Side
No backend servers - everything runs in your browser with Cloudflare DNS over HTTPS.
How to Use LDNS
DNS Analysis
Enter a domain name in the search bar on the homepage, or navigate directly to:
ldns.com/ldns.com Try it View all DNS records with micro cards summary, clickable filtering, and export options (JSON, CSV, BIND zone files, PDF).
Features include:
- Clickable record type cards for instant filtering
- Real-time record validation and error detection
- Export to multiple formats including PDF reports
- Direct links to specific record types
RDAP/WHOIS Data
Get comprehensive domain registration information at:
ldns.com/ldns.com/rdap Try it Includes micro cards summary showing domain age, expiration countdown, registrar, and DNSSEC status with detailed explanations.
Key features:
- Domain age calculator and expiration tracking
- DNSSEC status with DS record analysis
- Status code explanations (RFC 7483 compliant)
- Registrar and nameserver information
Email Security Analysis
Comprehensive email configuration and security analysis at:
ldns.com/ldns.com/email Try it Features detailed analysis of all email security protocols with validation and recommendations.
Analyzes:
- SPF - Sender Policy Framework validation and mechanism analysis
- DMARC - Policy validation and tag-by-tag breakdown
- MTA-STS - Mail Transfer Agent Strict Transport Security
- BIMI - Brand Indicators for Message Identification
- Email Provider Detection - Automatic MX provider identification