About DNS & Whois

Use DNS & Whois to Domain records. The tool runs in your browser for fast results and keeps your data local.

How to Use

  1. 1. Add your input or data.
  2. 2. Adjust options if needed.
  3. 3. Review the result and copy it.

What is DNS and Whois Lookup?

DNS (Domain Name System) lookup queries DNS records to resolve domain names to IP addresses and retrieve configuration information. Common DNS record types include A (IPv4 address), AAAA (IPv6 address), MX (mail servers), NS (nameservers), CNAME (aliases), and TXT (text records). Whois lookup queries domain registration databases to retrieve ownership information, registrar details, registration dates, and nameserver configuration. DNS and Whois lookups are essential for troubleshooting connectivity issues, verifying domain configuration, investigating security incidents, and researching domain ownership. These tools are fundamental for network administrators, security researchers, and web developers.

Common Use Cases

DNS and Whois lookups are essential for domain management and troubleshooting. System administrators verify DNS propagation after domain changes. Email administrators troubleshoot mail delivery by checking MX records. Security researchers investigate phishing domains and malicious infrastructure. Domain investors research domain ownership and expiration dates. Web developers verify DNS configuration for new deployments. Network engineers troubleshoot connectivity issues by checking A and AAAA records. Legal professionals investigate domain ownership for trademark disputes. SEO specialists verify domain authority and registration history.

  • Verifying DNS propagation after changes
  • Troubleshooting email delivery with MX records
  • Investigating phishing and malicious domains
  • Researching domain ownership and expiration
  • Verifying DNS configuration for deployments
  • Troubleshooting connectivity with A/AAAA records
  • Domain ownership investigation for legal cases
  • Verifying domain authority and registration history

Best Practices & Tips

Use multiple DNS servers to verify propagation across different resolvers. Check TTL (Time To Live) values to understand caching duration. Verify both A and AAAA records for dual-stack IPv4/IPv6 support. Use MX record priority values to understand mail routing. Check NS records to identify authoritative nameservers. Use TXT records to verify SPF, DKIM, and DMARC email authentication. Understand that Whois privacy protection may hide owner details. Use RDAP (Registration Data Access Protocol) for modern Whois queries. Remember DNS changes can take 24-48 hours to propagate globally.

  • Use multiple DNS servers to verify propagation
  • Check TTL values to understand caching duration
  • Verify both A and AAAA for IPv4/IPv6 support
  • Use MX priority to understand mail routing
  • Check NS records for authoritative nameservers
  • Verify SPF, DKIM, DMARC in TXT records
  • Whois privacy may hide owner details
  • Use RDAP for modern Whois queries
  • DNS propagation can take 24-48 hours globally

Troubleshooting Common Issues

If DNS lookup fails, verify the domain name is spelled correctly and exists. If records are outdated, check TTL and wait for cache expiration or flush DNS cache. If different DNS servers return different results, DNS propagation is incomplete. If Whois lookup fails, the domain may use privacy protection or the TLD may not support Whois. If MX records are missing, email delivery will fail—verify mail server configuration. If NS records are incorrect, DNS resolution will fail entirely. If DNSSEC validation fails, check for configuration errors in DNS records. If rate limiting occurs, reduce query frequency or use different DNS servers.

  • DNS lookup failing due to typos or non-existent domain
  • Outdated records due to TTL caching
  • Different results from different DNS servers (propagation)
  • Whois lookup blocked by privacy protection
  • Missing MX records causing email delivery failure
  • Incorrect NS records breaking DNS resolution
  • DNSSEC validation errors from misconfiguration
  • Rate limiting from excessive queries

Frequently Asked Questions

Is DNS & Whois free to use?

Yes. DNS & Whois is free and works directly in your browser.

Does DNS & Whois upload my data?

No. Most processing happens locally. Any network requests are clearly indicated.

What formats does DNS & Whois support?

DNS & Whois supports the common formats described on the page. Convert uncommon formats before pasting.

How should I share results from DNS & Whois?

Copy the output and review any sensitive data before sharing or publishing.