DNS Lookup Tool - Check Domain DNS Records & Nameserver Information
Professional DNS lookup tool for checking A, AAAA, CNAME, MX, NS, TXT, SOA, PTR, SRV, and CAA records with multiple nameserver support and detailed analysis.
The DNS Lookup Tool is a comprehensive network diagnostic utility designed for system administrators, web developers, and IT professionals. It provides detailed DNS record information for any domain using various nameservers including Google DNS, Cloudflare, OpenDNS, and Quad9. This tool helps troubleshoot DNS issues, verify record propagation, analyze domain configurations, and ensure proper DNS setup for websites and email services.
How to Use the DNS Lookup Tool
- Enter the domain name or IP address you want to lookup
- Select the DNS record type (A, AAAA, CNAME, MX, NS, TXT, etc.)
- Choose a nameserver or use system default
- Click "Lookup" to query DNS records
- View detailed results including TTL values and priorities
- Copy individual records or entire result sets to clipboard
- Use different nameservers to verify DNS propagation
Advanced DNS Features
- Support for all major DNS record types (A, AAAA, CNAME, MX, NS, TXT, SOA, PTR, SRV, CAA)
- Multiple nameserver options (Google, Cloudflare, OpenDNS, Quad9)
- Real-time query performance metrics (response time)
- Detailed record information with TTL and priority values
- Reverse DNS lookup (PTR records) for IP addresses
- Bulk record copying and export functionality
- Query history with recent lookup results
- Support for IPv6 addresses and AAAA records
- SOA record analysis for authoritative information
- CAA record checking for certificate authority validation
Why Use Our DNS Lookup Tool
DNS lookup is fundamental to internet connectivity and troubleshooting. This tool provides comprehensive DNS record analysis with real-time queries across multiple record types. Whether you're diagnosing connectivity issues, verifying domain configurations, or monitoring DNS propagation, having accurate and immediate DNS information is crucial for maintaining reliable web services and email delivery.
Common Use Cases
Domain configuration troubleshooting
Verify DNS records and troubleshoot domain configuration issues
Email server setup validation
Check MX records when setting up email servers
Website migration monitoring
Monitor DNS propagation during website migrations
Security analysis
Inspect SPF, DKIM, DMARC records for email security
Load balancer verification
Verify load balancer and CDN configuration
DNS Lookup Best Practices
- Use multiple nameservers to verify DNS propagation across different providers
- Check TTL values to understand caching behavior and update timing
- Verify MX records when troubleshooting email delivery issues
- Monitor SOA records for domain authority and refresh intervals
- Use TXT records to validate SPF, DKIM, and DMARC email security
- Check CNAME chains to avoid redirect loops and performance issues
- Verify CAA records when setting up SSL certificates
- Use PTR lookups for reverse DNS verification and spam prevention
How DNS Lookup Works
DNS (Domain Name System) translates human-readable domain names into IP addresses that computers use to communicate. Our tool queries authoritative nameservers directly to retrieve current DNS records including A/AAAA (IP addresses), MX (mail servers), TXT (text records), CNAME (aliases), NS (nameservers), and SOA (start of authority) records. The tool provides real-time results with query performance metrics and supports all major record types for comprehensive domain analysis.
Related Network Tools
Frequently Asked Questions
What's the difference between A and AAAA records?
A records map domain names to IPv4 addresses (like 192.168.1.1), while AAAA records map to IPv6 addresses (like 2001:db8::1). Both are address records but for different IP versions.
Why do I get different results from different nameservers?
DNS propagation takes time, and different nameservers may have cached different versions of records. This is normal during DNS changes and usually resolves within 24-48 hours.
What is TTL and why does it matter?
TTL (Time To Live) specifies how long DNS records should be cached. Lower TTL values mean faster propagation of changes but more DNS queries, while higher values reduce load but slow updates.
How do I use this tool for email troubleshooting?
Check MX records to verify mail server configuration, TXT records for SPF/DKIM/DMARC policies, and ensure PTR records exist for your mail server's IP to prevent spam filtering.
What are the most reliable public DNS servers to use?
Google DNS (8.8.8.8), Cloudflare (1.1.1.1), OpenDNS (208.67.222.222), and Quad9 (9.9.9.9) are reliable options. Each has different features like malware filtering or privacy focus.
How can I verify my domain's DNS configuration is correct?
Check that A/AAAA records point to your web server, MX records point to mail servers, NS records show authoritative nameservers, and TXT records contain required verification codes.
What does 'NXDOMAIN' mean in DNS lookup results?
NXDOMAIN means the domain name doesn't exist or has no DNS records of the requested type. This could indicate a typo, unregistered domain, or missing DNS configuration.