Free DNS lookup, email authentication, and domain security tools. Everything you need to manage, analyze, and secure your domains.
Query A, AAAA, MX, TXT, NS, SOA, CNAME records for any domain
Deep analysis with email authentication and mail server checks
Search and filter specific DNS record types
Domain registration, ownership, and expiration details
Check multiple domains simultaneously
Validate SPF records and check DNS lookup limits
Create and validate SPF records step-by-step
Discover and validate DKIM selectors and keys
Check DMARC policy and reporting configuration
Create and validate DMARC policies step-by-step
Parse and analyze email headers for authentication results
DNSai tools perform real-time DNS queries against authoritative nameservers to deliver accurate, up-to-date results. When you look up a domain, we query multiple DNS resolvers globally to ensure you see the actual propagated records, not cached data.
For email authentication tools, we parse SPF, DKIM, and DMARC records according to RFC specifications, checking for common misconfigurations like exceeding the 10-lookup SPF limit, missing DKIM selectors, or overly permissive DMARC policies.
All basic lookups are free and require no account. For enterprise features like unlimited bulk scanning, API access, and scheduled monitoring, explore DNS Explorer.
DNSai offers a comprehensive suite of free DNS tools including DNS lookup, advanced DNS lookup, WHOIS lookup, SPF analyzer, SPF record builder, DKIM lookup, DMARC lookup, DMARC record builder, blacklist checker, email header analyzer, and bulk DNS lookup capabilities. All tools are browser-based and require no installation.
Use DNSai's email authentication tools: Start with the SPF Analyzer to verify your SPF record syntax and DNS lookup count. Then use DKIM Lookup to check your DKIM signatures, and DMARC Lookup to verify your DMARC policy. For a comprehensive check, the Advanced DNS Lookup tool examines all three protocols simultaneously.
DNS Lookup performs standard DNS record queries (A, AAAA, MX, TXT, NS, SOA, CNAME) for any domain. Advanced DNS Lookup goes further by specifically analyzing email authentication records (SPF, DKIM, DMARC), checking mail server connectivity, discovering DKIM selectors, and providing detailed diagnostics about email deliverability configuration.
Yes, DNSai's Bulk Lookup tool allows you to check multiple domains simultaneously. For enterprise-scale operations involving thousands of domains, DNS Explorer provides unlimited bulk lookups with advanced filtering, CSV export, and detailed reporting capabilities.
Use DNSai's SPF Record Builder and DMARC Record Builder tools. These interactive builders guide you through each option, help you select your email providers (Microsoft 365, Google Workspace, etc.), and generate properly formatted records ready to add to your DNS. Both tools also include validators to check existing records for errors.
DNS Explorer — Run bulk DKIM, SPF, and DMARC lookups across thousands of domains. Built for security teams, MSPs, and IT administrators who need to audit email authentication configurations across their entire domain portfolio.
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